Fisher, Evryl E., author
Juta & Company Ltd., 1979
Buku Teks
Burgess, Ann Wolbert
Prentice-Hall, 1985
Buku Teks
Morrissey, Jean, author
McGraw-Hill, 2011
Buku Teks
Robinson, Lisa
W.B. Saunders , 1983
Buku Teks
Higgins, Ray, author
Whurr , 1999
Buku Teks