Schermerhorn, John R., author
John Wiley & Sons, 2003
Buku Teks
Carroll, Stephen J., author
John Wiley & Sons, 1977
Buku Teks
Allyn and Bacon, 1990
Buku Teks
Knudson, Harry R., author
Winthrop, 1978
Buku Teks
Schermerhorn, John R., author
John Wiley & Sons, 1991
Buku Teks