Ballou, Ronald H., author
Ginn, 1943
Buku Teks
Bauer, George N., author
D.C. Heath, 1932
Buku Teks
Marcus, Marvin, author
Houghton Mifflin, 1970
Buku Teks
Rice, Bernard J., author
Prindle, Weber & Schmidt, 1975
Buku Teks
Cameron, Edward A., author
Holt, Rinehart and Winston, 1965
Buku Teks