Dobson, Annette, author
Chapman and Hall, 1983
Buku Teks
Lokanathan, S., author
Prentice-Hall of India, 1991
Buku Teks
Li, Jerome C.R., author
Edwards Brothers, 1964
Buku Teks
Bryant, Edward C., author
McGraw-Hill Book , 1966
Buku Teks
Ott, Lyman, author
Duxbury Press, 1993
Buku Teks