Stettler, Howard F., author
Prentice-Hall, 1974
Buku Teks
Stettler, Howard F., author
Prentice-Hall, 1967
Buku Teks
Stettler, Howard F., author
Prentice-Hall, 1982
Buku Teks
Cutforth, Arthur E., author
Gee and Company, 1971
Buku Teks
Ray, J.C., author
Holt, Rinehart and Winston, 1964
Buku Teks