Hart, Harold, 1922-, author
Houghton Miffiln, 1991
Buku Teks
Ouellette, Robert J., author
Prentice-Hall, 1994
Buku Teks
Brown, William H., author
Saunders College, 1997
Buku Teks
McMurry, John, author
Brooks/Cole Pub., 1994
Buku Teks
Morrison, Robert Thornton, author
Prentice-Hall, 1992
Buku Teks