Stelzer, Irwin M
Richard D. Irwin, 1986
Buku Teks
Stelzer, Irwin M.
Richard D. Irwin, Inc., 1976
Buku Teks
Cappeletti, Mauro
The Bobbs - Merrill Company,INC, 1979
Buku Teks
Universitas Indonesia, 2011
UI - Skripsi (Open)
Benny Hopman, author
2012
UI - Skripsi (Open)