- https://books.google.com/books?id=aMRqDwAAQBAJ&pg=PA262&dq=Georg+Biedenkapp&hl=en&newbks=1&newbks_redir=0&sa=X&ved=2ahUKEwiyqe22lv-DAxUNv4kEHS3_CTcQ6AF6BAgREAI#v=onepage&q=Georg%20Biedenkapp&f=false
- ? https://books.google.com/books?id=rPzsEAAAQBAJ&pg=PA222&dq=Georg+Biedenkapp&hl=en&newbks=1&newbks_redir=0&sa=X&ved=2ahUKEwiyqe22lv-DAxUNv4kEHS3_CTcQ6AF6BAgIEAI#v=onepage&q=Georg%20Biedenkapp&f=false
- Beer and Revolution mentions
- https://books.google.com/books?id=-kTPEAAAQBAJ&pg=PA678&dq=Georg+Biedenkapp&hl=en&newbks=1&newbks_redir=0&sa=X&ved=2ahUKEwiQ0Y2xl_-DAxVkATQIHZXKDJ04FBDoAXoECAwQAg#v=onepage&q=Georg%20Biedenkapp&f=false
- https://www.jstor.org/stable/23030274?searchText=Georg%20Biedenkapp&searchUri=%2Faction%2FdoBasicSearch%3FQuery%3DGeorg%2BBiedenkapp&ab_segments=0%2FSYC-7052%2Ftest&refreqid=fastly-default%3Aa5b19830895317962235c6f0f93d5a70
