https://digital.katalog.queersearch.org/s/katalog/item/43733, “Homosexualiteit in Nederland. Studie van een emancipatiebeweging”, https://digital.katalog.queersearch.org/s/katalog/item/49962, QueerSearch, accessed 18. Mai 2025, https://digital.katalog.queersearch.org/s/katalog/item/26789