Dunn, Charles, author
Macmillan, 1971
Buku Teks
Meyer, Robert G., author
Pearson, Allyn and Bacon, 2006
Buku Teks
Meyer, Robert G., author
Pearson, 2014
Buku Teks
edited b: Wallace R. Blischke, D.N. Prabhakar Murthy
John Wiley & Sons, 2003
Buku Teks
Cummings, Louise, author
Cambridge University Press, 2016
Buku Teks