edited by Joel J. Lersier
Englewood Cliffs, N.J., Prentice-Hall
Buku Teks
Achinstein, Asher, author
Thomas Y. Crowell, 1950
Buku Teks
Meier, Robert C., author
McGraw-Hill, 1960
Buku Teks
Pickle, Hal B.
Goodyear Publishing Company, Inc., 1972
Buku Teks
Monsen, R. Joseph, author
Houghton Mifflin, 1967
Buku Teks