https://digital.katalog.queersearch.org/s/katalog/item/43889, “[Collected reprints] V.1: 1911-1913; V.2: 1914-1920; V.3: 1925-1928; V.4: 1929- 1941; V. 5: 1949-1952”, QueerSearch, accessed 15. März 2025, https://digital.katalog.queersearch.org/s/katalog/item/27039