Lynch, Thomas F.
Pocatello, 1967
Buku Teks
Steward, Julian H.
McGraw-Hill, 1959
Buku Teks
Zikmund, Miroslav, author
Artia, 1963
Buku Teks
Collier, John, 1884-1968, author
New American Library, 1947
Buku Teks
Lisa Tanugraha, author
Universitas Indonesia, 1997
UI - Tesis (Membership)