Newstrom, John W., author
McGraw-Hill, 1975
Buku Teks
Hill, Charles W. L., author
Houghton Miffinn, 1989
Buku Teks
Gillies, Dee Ann, author
W.B: Saunders , 1994
Buku Teks
Cleland, David I., author
McGraw-Hill, 1972
Buku Teks
Sanford, Edward, author
Winthrop, 1977
Buku Teks