Mellor, John W.
Cornell University Press, 1976
Buku Teks
Veit, Lawrence A., author
McGraw-Hill, 1976
Buku Teks
Weiss, John, author
Prentice-Hall, 1995
Buku Teks
Myint, Hla, author
Hutchinson University Library, 1973
Buku Teks
editor, Williard A. Beling, George O. Totten
Rajawali , 1985
Buku Teks