Cox, George, author
Thomson Learning, 2001
Buku Teks
Janine M. Ubink, editor
Leiden University Press, 2009
Buku Teks
edited by Herbert L. Marx
H.W. Wilson, 1962
Buku Teks
Fisher, Ronald C., author
Routledge, 2016
Buku Teks
Fisher, Ronald C., author
Scott, Foresman, 1988
Buku Teks