Steven, Laurence, author
Prentice-Hall, 1999
Buku Teks
Holladay, Sylvia A., author
Prentice-Hall, 1981
Buku Teks
Foss, Sonja K., compiler
Waveland Press, 1985
Buku Teks
Love, Glen A.
Foresmann, 1969
Buku Teks
Mcmahan, Elizabeth
McGraw-Hill, 1984
Buku Teks