Good, Carter V., author
Appleton Century Crofts, 1954
Buku Teks
edited by Martin Bulmer
Macmillan, 1984
Buku Teks
Craig, James R., author
Saunders, 1986
Buku Teks
Novick, Melvin R.
McGraw-Hill, 1974
Buku Teks
Lodico, Marguerite G., author
Jossey-Bass, 2010
Buku Teks