https://digital.katalog.queersearch.org/s/katalog/item/41098, “Prevention of HIV Infection Among Homosexual Men: Behavior Cange and Behavioral Determinants”, https://digital.katalog.queersearch.org/s/katalog/item/48760, QueerSearch, accessed 20. Juni 2025, https://digital.katalog.queersearch.org/s/katalog/item/17492