Marston, John E., author
McGraw-Hill, 1979
Buku Teks
DuBrin, Andrew J., author
Pearson education International, 2009
Buku Teks
Craig, David R., author
McGraw-Hill, 1941
Buku Teks
Halloran, Jack, 1931-, author
Prentice-Hall, 1978
Buku Teks
Dubin, Robert, author
Prentice-Hall, 1959
Buku Teks