Ryans, John K., author
Ohio Kent State University Press , 1974
Buku Teks
Stachnke, Arthur A
Preager, 1972
Buku Teks
Kretschmar, Robert S., Jr.
Preager, 1972
Buku Teks
Payer, Cheryl
Macmillan, 1975
Buku Teks
Soemitro Djojohadikusumo, author
F.W Cheshire, 1968
Buku Teks