Adams, John, 1938-, author
St. Martin's Press, 1985
Buku Teks
Livingstone, D.W.
Sense, 2012
eBooks
edited by George T. Crane and Abla Amawi
Oxford University Press, 1997
Buku Teks
Rosser, J. Barkley, author
McGraw-Hill, 1996
Buku Teks
Routledge , 2000
Buku Teks