https://digital.katalog.queersearch.org/s/katalog/item/42760, “Kölner Lesben- und Schwulentag e.V. c/o Schulz 1994 – 1. + 2. + 3”, 1994, QueerSearch, accessed 19. Juni 2025, https://digital.katalog.queersearch.org/s/katalog/item/21532