Dianekratz (March 31, 2012). "Hans Gustav Adolf Gross". Profiles of Murder. Archived from the original on November 5, 2018. Retrieved October 14, 2017.
web.archive.org
Dianekratz (March 31, 2012). "Hans Gustav Adolf Gross". Profiles of Murder. Archived from the original on November 5, 2018. Retrieved October 14, 2017.