Handler, Milton
The Foundation Press, 1967
Buku Teks
Boies, David.
Little, Brown, 1977
Buku Teks
The Foundation Press, Inc., 1975
Buku Teks
Schnitzer, Martin C.
Rand McNally College Publishing , 1978
Buku Teks
Schnitzer, Martin C.
Honghton Miffn, 1987
Buku Teks