diff --git a/Projektarbeit-3.md b/Projektarbeit-3.md
index 64fdf20..a90f0ab 100644
--- a/Projektarbeit-3.md
+++ b/Projektarbeit-3.md
@@ -5,5 +5,11 @@
 Referenz:
 * https://gitlab.rz.hft-stuttgart.de/coors/gvi_ws20_21/-/wikis/Projektarbeit_3
 * https://gitlab.com/volkercoors/HFT_Stuttgart_PG_Visualization/-/wikis/visualization-of-bike-sharing-data
+
+Frontend:
+* https://docs.mapbox.com/mapbox-gl-js/example/
+
+Backend
 * https://cycling.data.tfl.gov.uk
-* https://www.sqlitetutorial.net/sqlite-import-csv/
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+* https://www.sqlitetutorial.net/sqlite-import-csv/
+* https://flask.palletsprojects.com/en/1.1.x/patterns/sqlite3/
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