Sudarmodjo
1990
UI - Skripsi (Membership)
Pole, J.R.
University of California Press, 1993
Buku Teks
Kohn, Hans
D. Van Nostrand Company, Inc., 1963
Buku Teks
Bouman, P. J. (Pieter Jan)
McGraw-Hill , 1954
Buku Teks
Snyder, Louis L.
D. van Nastrand Company, Inc., 1967
Buku Teks