diff --git a/datasheets/axles.json b/datasheets/axles.json
index 98a0be24e4948e410155aafb1183392d05fdf2e4..50d3abf8507f5354846010f27accc2a817858f02 100644
--- a/datasheets/axles.json
+++ b/datasheets/axles.json
@@ -6,7 +6,8 @@
         "price [Euro]":0.001,
         "mass [g]":0.66,
         "delivery time [days]":3,
-        "Abmessung [studs]":5
+        "data source":"https:\/\/www.bricklink.com\/v2\/catalog\/catalogitem.page?P=32073#T=S&O={%22iconly%22:0}",
+        "dimension [studs]":5
     },
     "44294":{
         "item number":44294,
@@ -15,7 +16,8 @@
         "price [Euro]":0.01,
         "mass [g]":1.05,
         "delivery time [days]":3,
-        "Abmessung [studs]":7
+        "data source":"https:\/\/www.bricklink.com\/v2\/catalog\/catalogitem.page?P=44294#T=S&O={%22iconly%22:0}",
+        "dimension [studs]":7
     },
     "3707":{
         "item number":3707,
@@ -24,7 +26,8 @@
         "price [Euro]":0.01,
         "mass [g]":1.18,
         "delivery time [days]":3,
-        "Abmessung [studs]":8
+        "data source":"https:\/\/www.bricklink.com\/v2\/catalog\/catalogitem.page?P=3707#T=S&O={%22iconly%22:0}",
+        "dimension [studs]":8
     },
     "60485":{
         "item number":60485,
@@ -33,7 +36,8 @@
         "price [Euro]":0.01,
         "mass [g]":1.3,
         "delivery time [days]":7,
-        "Abmessung [studs]":9
+        "data source":"https:\/\/www.bricklink.com\/v2\/catalog\/catalogitem.page?P=60485#T=S&O={%22iconly%22:0}",
+        "dimension [studs]":9
     },
     "3737":{
         "item number":3737,
@@ -42,7 +46,8 @@
         "price [Euro]":0.01,
         "mass [g]":1.49,
         "delivery time [days]":7,
-        "Abmessung [studs]":10
+        "data source":"https:\/\/www.bricklink.com\/v2\/catalog\/catalogitem.page?P=3737#T=S&O={%22iconly%22:0}",
+        "dimension [studs]":10
     },
     "23948":{
         "item number":23948,
@@ -51,7 +56,8 @@
         "price [Euro]":0.15,
         "mass [g]":1.65,
         "delivery time [days]":3,
-        "Abmessung [studs]":11
+        "data source":"https:\/\/www.bricklink.com\/v2\/catalog\/catalogitem.page?P=23948#T=S&O={%22iconly%22:0}",
+        "dimension [studs]":11
     },
     "3708":{
         "item number":3708,
@@ -60,7 +66,8 @@
         "price [Euro]":0.02,
         "mass [g]":1.82,
         "delivery time [days]":7,
-        "Abmessung [studs]":12
+        "data source":"https:\/\/www.bricklink.com\/v2\/catalog\/catalogitem.page?P=3708#T=S&O={%22iconly%22:0}",
+        "dimension [studs]":12
     },
     "50451":{
         "item number":50451,
@@ -69,6 +76,7 @@
         "price [Euro]":0.75,
         "mass [g]":2.37,
         "delivery time [days]":3,
-        "Abmessung [studs]":16
+        "data source":"https:\/\/www.bricklink.com\/v2\/catalog\/catalogitem.page?P=50451#T=S&O={%22iconly%22:0}",
+        "dimension [studs]":16
     }
 }
\ No newline at end of file
diff --git a/datasheets/gears.json b/datasheets/gears.json
index db6e1c8ba22964a9c89a375e6b5a1533cb4f70d8..6f639555cdc9405eb527d91d1356db9748acd347 100644
--- a/datasheets/gears.json
+++ b/datasheets/gears.json
@@ -5,7 +5,8 @@
         "category":"gear",
         "price [Euro]":0.14,
         "mass [g]":0.16,
-        "delivery time [days]":11
+        "delivery time [days]":11,
+        "data source":"https:\/\/www.bricklink.com\/v2\/catalog\/catalogitem.page?P=3647#T=C"
     },
     "94925":{
         "item number":94925,
@@ -13,7 +14,8 @@
         "category":"gear",
         "price [Euro]":0.2,
         "mass [g]":0.7,
-        "delivery time [days]":12
+        "delivery time [days]":12,
+        "data source":"https:\/\/www.bricklink.com\/v2\/catalog\/catalogitem.page?P=94925#T=C"
     },
     "32269":{
         "item number":32269,
@@ -21,7 +23,8 @@
         "category":"gear",
         "price [Euro]":0.36,
         "mass [g]":1.4,
-        "delivery time [days]":13
+        "delivery time [days]":13,
+        "data source":"https:\/\/www.bricklink.com\/v2\/catalog\/catalogitem.page?P=32269#T=C"
     },
     "3648":{
         "item number":3648,
@@ -29,7 +32,8 @@
         "category":"gear",
         "price [Euro]":0.32,
         "mass [g]":1.17,
-        "delivery time [days]":11
+        "delivery time [days]":11,
+        "data source":"https:\/\/www.bricklink.com\/v2\/catalog\/catalogitem.page?P=3648#T=C"
     },
     "3650":{
         "item number":3650,
@@ -37,7 +41,8 @@
         "category":"gear",
         "price [Euro]":0.09,
         "mass [g]":1.03,
-        "delivery time [days]":13
+        "delivery time [days]":13,
+        "data source":"https:\/\/www.bricklink.com\/v2\/catalog\/catalogitem.page?P=3650#T=C"
     },
     "3649":{
         "item number":3649,
@@ -45,7 +50,8 @@
         "category":"gear",
         "price [Euro]":0.81,
         "mass [g]":3.76,
-        "delivery time [days]":11
+        "delivery time [days]":11,
+        "data source":"https:\/\/www.bricklink.com\/v2\/catalog\/catalogitem.page?P=3649#T=C"
     },
     "32498":{
         "item number":32498,
@@ -53,7 +59,8 @@
         "category":"gear",
         "price [Euro]":0.88,
         "mass [g]":3.5,
-        "delivery time [days]":12
+        "delivery time [days]":12,
+        "data source":"https:\/\/www.bricklink.com\/v2\/catalog\/catalogitem.page?P=32498#T=C"
     },
     "6588":{
         "item number":6588,
@@ -61,7 +68,8 @@
         "category":"gear",
         "price [Euro]":1.63,
         "mass [g]":4.5,
-        "delivery time [days]":11
+        "delivery time [days]":11,
+        "data source":"https:\/\/www.bricklink.com\/v2\/catalog\/catalogitem.page?P=6588#T=C"
     },
     "4716":{
         "item number":4716,
@@ -69,6 +77,7 @@
         "category":"gear",
         "price [Euro]":0.54,
         "mass [g]":0.6,
-        "delivery time [days]":12
+        "delivery time [days]":12,
+        "data source":"https:\/\/www.bricklink.com\/v2\/catalog\/catalogitem.page?P=4716#T=C"
     }
 }
\ No newline at end of file
diff --git a/datasheets/lego_item_list_FAIR-quality_kpis.xlsx b/datasheets/lego_item_list_FAIR-quality_kpis.xlsx
index 349fc2ea3cab9d3f9ff388f59d99ee5f230bf89b..761559a2b09f654324307d588ee564bc2101a407 100644
Binary files a/datasheets/lego_item_list_FAIR-quality_kpis.xlsx and b/datasheets/lego_item_list_FAIR-quality_kpis.xlsx differ