Gordon, David M.
Lexington Books, 1972
Buku Teks
edited by Arthur M. Ross
University of California Press, 1965
Buku Teks
Bakke, Edward Wight, author
Charlew E. Merrill Books, 1963
Buku Teks
Levitan, Sar A., author
Harper & Row, 1982
Buku Teks
Jakubuskas, Edward B., author
Addison-Wesley, 1973
Buku Teks