Rautenstrauch, Walter, author
Funk & Wagnalls, 1957
Buku Teks
Wixon, Rufus
Alexander Hamilton Institute , 1961
Buku Teks
Jakhotiya, G.P., author
Tata McGraw-Hill, 1989
Buku Teks
Martin, Murray S., author
JAI Press, 1978
Buku Teks
Ferry Firmansyah, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 1982
UI - Skripsi (Membership)