edited by Joel J. Lersier
Englewood Cliffs, N.J., Prentice-Hall
Buku Teks
Walthall, Wylie A., author
Harper and Row, 1987
Buku Teks
Achinstein, Asher, author
Thomas Y. Crowell, 1950
Buku Teks
Meier, Robert C., author
McGraw-Hill, 1960
Buku Teks
revised by Benjamin Perles and Charles Sullivan
Prentice-Hall, 1979
Buku Teks