https://digital.katalog.queersearch.org/s/katalog/item/38601, “How to Be Happy though Married: 7th Revised & Enlarged Edition”, https://digital.katalog.queersearch.org/s/katalog/item/50697, QueerSearch, accessed 1. Mai 2025, https://digital.katalog.queersearch.org/s/katalog/item/29000