Dunn, Charles, author
Macmillan, 1971
Buku Teks
Weiss, Leonard W., author
John Wiley & Sons, 1980
Buku Teks
Meyer, Robert G., author
Pearson, Allyn and Bacon, 2006
Buku Teks
Meyer, Robert G., author
Pearson, 2014
Buku Teks
Veatch, Robert M., author
Oxford University Press, 2008
Buku Teks