@inbook{Kleinschmidt1931a, author = "O. Kleinschmidt", title = "Urmensch und Neuzeitmensch", year = 1931, booktitle = "Der Urmensch", publisher = "Leipzig", pages = "103-120", note = "only in german" } @article{Kleinschmidt1927-ei, author = "O. Kleinschmidt", title = "Homo sapiens: Eine naturgeschichtliche monographie des menschen (Continuation)", year = 1927, journal = "Berajah, zoographia infinita", publisher = "Gebauer-Schwetschke Dr. u. Verlag m. b. H.", volume = 27, pages = "31-38", url = "https://play.google.com/store/books/details?id=FB64QAAACAAJ" } @article{Kleinschmidt1922-ei, author = "O. Kleinschmidt", title = "Homo sapiens: Eine naturgeschichtliche monographie des menschen", year = 1922, journal = "Berajah, zoographia infinita", publisher = "Gebauer-Schwetschke Dr. u. Verlag m. b. H.", volume = 27, pages = "1-30", url = "https://play.google.com/store/books/details?id=FB64QAAACAAJ" }