Schapiro, J. Salwyn
McGraw-Hill Book Company, Inc., 1950
Buku Teks
Rand McNally & Company, 1960
Buku Teks
M. Samidjo Dwidjosoemarto, author
S.M. Diwarno, [date of publication not identified]
Buku Klasik
Sedillot, Rene
A Mentor Book , 1976
Buku Teks
Georg Westermann, 1956
Buku Referensi