Erika De Wet and Jure Vidmar, editors
Oxford university press, 2012
Buku Teks
Gibson, John S., author
Praeger, 1991
Buku Teks
Lautenbach, Geranne, author
Oxford Univ.press, 2014
Buku Teks
Drost, Pieter N., author
A.W. Sijthoff, 1951
Buku Teks
Drost, Pieter N., author
A.W. Sijthoff, 1965
Buku Teks