Reis, Matthew
American Management Association, 2010
eBooks
Wexley, Kenneth N.
Irwin, 1984
Buku Referensi
French, Wendell L.
Harper & Row, 1985.
Buku Teks
Greenberg, Jerald
Prentice-Hall, 2003
Buku Teks
Borkowski, Nancy
Jones & Bartlett Learning, 2016
Buku Teks