Rash, J. Keogh
John Wiley & Sons, 1979
Buku Teks
Parrott, Eugene L., author
Burgess Publ., 1970
Buku Teks
Bakht, Baidar, author
McGraw-Hill, 1985
Buku Teks
Potts, Leonard James
Hutchinson's University Library, 1998
Buku Teks
Kingsbury, Damien, author
Oxford University Press, 2005
Buku Teks