Peason, Karl
Meridian Books , 1957
Buku Teks
Banning, W., author
De Arbeiderspers, 1950
Buku Teks
Vorlander, Karl
Gustav Kiepenheuer Verla, 1932
Buku Teks
Mardety, author
Universitas Indonesia, 1988
UI - Skripsi (Membership)
Muhs, Karl
Duncker & Humblot, 1950
Buku Teks