Swansburg, Russell C.
Jones and Bartlett, 1990
Buku Teks
Petit, Thomas A.
John Weatherhill, Inc., 1975
Buku Teks
Macnamara, Jim
Prentice Hall Australia, 1996
Buku Referensi
Penner, Susan J.
Springer, 2017
Buku Teks
Rachlin, Robert
American Management Association, 1996
eBooks