Mohamad Sobary
Zaman Wacana Mulia, 1998
Buku Teks SO
Ignasius Bambang Sugiharto
Universitas Indonesia, 1987
UI - Skripsi Membership
Hoover, Kenneth R., 1940-
Tiara Wacana, 1989
Buku Teks SO
editor, Christopher Lloyd ; penerjemah Nazaruddin Sjamsudin
Rajawali, 1986
Buku Teks SO
Ahmad Kamar
Petaling Jaya, 1982
Buku Teks SO