Anderson, Ronald A., author
South-Western Publishing Company, 1950
Buku Teks
Watson, Donald Stevenson, author
Houghton Miffiln, 1960
Buku Teks
Schnitzer, Martin C.
Honghton Miffn, 1987
Buku Teks
Schnitzer, Martin C.
Rand McNally College Publishing , 1978
Buku Teks
Boies, David.
Little, Brown, 1977
Buku Teks