Riza Umary, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2008
UI - Tesis (Open)
Chruden, Herbert J.
South-Western, 1966
Buku Teks
Randall S.Schuler, Susan E.Jackson, editor
Blackwell Publisher, 2000
Buku Teks
Greer, Charles R., author
Prentice-Hall, 2001
Buku Teks
Torpey, William G.,
D.Van Nostrand, 1953
Buku Teks