Harris, J. Manville.
Barron's Educational Series, 1992
Buku Teks
Ward, Richard, author
Prentice-Hall, 1965
Buku Teks
Ward, Richard, author
Prentice-Hall, 1965
Buku Teks
Wasserman, Max J.
D.C. Health and Company, 1966
Buku Teks
Melvin, Michael, author
HarperCollins, 1995
Buku Teks