diff --git a/thesis.bib b/thesis.bib
index da32466..6b01ee8 100644
--- a/thesis.bib
+++ b/thesis.bib
@@ -1677,22 +1677,30 @@ https://docs.google.com/spreadsheets/d/1ymREowDj40tYuA5CXd4IfC4WYPXxlx5hq1x8tQcW
 }
 
 @InProceedings{MI191_2021,
-  author            = {Reinhard Remfort, Nicolas Wöhrl},
-  booktitle         = {Methodisch Inkorrekt},
-  title             = {{M}191 - {F}remdkork},
-  year              = {2021},
-  month             = may,
-  number            = {191},
-  series            = {Audio-Podcast},
-  collection-number = {191},
-  collection-title  = {Methodisch Inkorrekt},
-  date              = {18.05.2021},
-  entrysubtype      = {podcastepisode},
-  groups            = {Verwendet},
-  journal           = {Methodisch Inkorrekt},
-  qualityassured    = {qualityAssured},
-  url               = {https://minkorrekt.de/mi191-fremdkork/},
-  urldate           = {2021-08-05},
+  author         = {Reinhard Remfort, Nicolas Wöhrl},
+  booktitle      = {Methodisch Inkorrekt},
+  title          = {{M}191 - {F}remdkork},
+  year           = {2021},
+  month          = may,
+  number         = {191},
+  series         = {Audio-Podcast},
+  date           = {18.05.2021},
+  groups         = {Verwendet},
+  journal        = {Methodisch Inkorrekt},
+  qualityassured = {qualityAssured},
+  url            = {https://minkorrekt.de/mi191-fremdkork/},
+  urldate        = {2021-08-05},
+}
+
+@InCollection{Alt_1994a,
+  author    = {Christian Alt and Walter Bien},
+  booktitle = {Gewichtung in der Umfragepraxis},
+  publisher = {{VS} Verlag für Sozialwissenschaften},
+  title     = {{G}ewichtung, ein sinnvolles {V}erfahren in den {S}ozialwissenschaften? {F}ragen, {P}robleme und {S}chlu{\ss}folgerungen},
+  year      = {1994},
+  pages     = {124--140},
+  doi       = {10.1007/978-3-663-08044-2_10},
+  groups    = {Verwendet},
 }
 
 @Comment{jabref-meta: databaseType:bibtex;}