edited by C.H. Philips
Oxford University Press, 1961
Buku Teks
Dunlap, Peter T., author
Routledge; Taylor & Francis Group, 2008
Buku Teks
Diebold, John
D> Van Nostrand Company, Inc, 1952
Buku Teks
Gzella, Holger, author
Brill, 2015
Buku Teks
Amnesty International Publication, 1982
Buku Teks