Holt, Robert T., author
University of Minnesota Press, 1958
Buku Teks
Benoit, Emile
Columbia University Press, 1962
Buku Teks
Edited by Tiziano Bonini, Belen Monclus
Routledge, 2015
Buku Teks
edited by Rajah Rasiah and Norbert von Hofmann
Fredrich Ebertstiftung, 1995
Buku Teks
Theo Publishing,
Majalah, Jurnal, Buletin