diff --git a/Koli_2017/Koli_2017_Stanger.bib b/Koli_2017/Koli_2017_Stanger.bib
index b912eb7..f2d9757 100644
--- a/Koli_2017/Koli_2017_Stanger.bib
+++ b/Koli_2017/Koli_2017_Stanger.bib
@@ -44,6 +44,13 @@
 	Volume = {4},
 	Year = {1998}}
 
+@online{Bergmann.S-2017a-PHPUnit,
+	Author = {Sebastian Bergmann},
+	Title = {{PHPUnit} Documentation, Chapter 8: Database Testing},
+	Url = {https://phpunit.de/manual/current/en/database.html},
+	Lastaccessed = {2017-07-31},
+	Year = {2017}}
+
 @inproceedings{Bhangdiya.A-2015a-XDa-TA,
 	Author = {Amol Bhangdiya and Bikash Chandra and Biplab Kar and Bharath Radhakrishnan and K. V. Maheshwara Reddy and Shetal Shah and S. Sudarshan},
 	Crossref = {Gehrke.J-2015a-ICDE},