https://digital.katalog.queersearch.org/s/katalog/item/37649, https://digital.katalog.queersearch.org/s/katalog/item/37394, and https://digital.katalog.queersearch.org/s/katalog/item/37795, “Die Freundin 1932 - Ausgabe 48”, QueerSearch, accessed 29. April 2025, https://digital.katalog.queersearch.org/s/katalog/item/3797