Swan, Michael
Cambridge University Press, 1992
Buku Teks SO
Bernice E. Cullinan, Roger C. Farr, W. Dorsey Hammond, Nancy L. Roser, Dorothy S. Strickland
Harcourt Brace Jovanovich, Publishers, 1989
Buku Teks SO
Bernice E. Cullinan, Roger C. Farr, W. Dorsey Hammond, Nancy L. Roser, Dorothy S. Strickland
Harcourt Brace Jovanovich, Publishers, 1989
Buku Teks SO
Sharpe, Pamela J.
Barron's, 2001
Buku Teks
Sullivan, Patricia Noble
Macmillan, 1997
Buku Teks SO