edited by Edwin A. Fleishman
Dorsey Press, 1967
Buku Teks
Cascio, Wayne F., author
Reston Pub. Co, 1982
Buku Teks
Tiffin, Joseph, author
Prentice-Hall, 1958
Buku Teks
McCormick, Ernest J. (Ernest James), author
Prentice-Hall, 1984
Buku Teks
edited by P.J.D. Drenth ... [and others]
Wiley, 1984
Buku Teks