edited by Vergilius Ferm
Philosophical Library, 1945
Buku Referensi
Farrington, Karen, author
Chancellor Pres, 1998
Buku Referensi
Evans-Pritchard, E.E. (Edward Evan), 1902-1973, author
Clarendon Press, 1956
Buku Teks
Weber, Max, 1864-1920, author
Beacon Press , 1963
Buku Teks
Barbu, Zevedei, author
Routledge , 1965
Buku Teks