Ashworth, Andrew, author
Oxford Univesity Press, 2014
Buku Teks
Wang, Lv, author
China Renmin University Press, 2015
eBooks
Pieper, Josef, author
Pantheon Books, 1955
Buku Teks
edited by Milton Fisk
Humanities Press, 1993
Buku Teks
Hubert, Charles I. (Charles Irving), author
McGraw-Hill, 1969
Buku Teks