McEachern, William A., author
South-Western College Publishing, 1988
Buku Teks
Preiss, Julian, author
Routledge, 2013
Buku Teks
Spencer, Milton H., author
Worth, 1971
Buku Teks
edited by Howard S. Elllis
Blakiston, 1949
Buku Teks
Slavin, Stephen, author
Richard D. Irwin, 1991
Buku Teks