McClelland, David Clarence, author
The Free Press, 1967
Buku Teks
McClelland, David Clarence, author
Vakils, Feffer and Simon Private, 1961
Buku Teks SO
McClelland, David Clarence, author
Feffer and Simons Private , 1961
Buku Teks
Bruce J. Reid; William Foster, editor
Gower, 2000
Buku Teks
Pinto, Jeffrey K., author
Pearson Prentice Hall, 2007
Buku Teks