Budi Ain Matallo
Elex Media Komputindo, 1989
Buku Teks
Johnson, D.E., author
Prentice-Hall, 1980
Buku Referensi
editor, M.J. Dooher ; associate editor, V. Marquis
American Management Association, 1953
Buku Teks
Fraden, Jacob, author
New York , Spinger
Buku Referensi
edited by Mario Paz
Chapman & Hall, 1994
Buku Referensi