Edited by: Paul J. Andrisani, Simon Hakim, E.S. Savas
Kluwer Academic Publishers, 2002
Buku Teks
Cox, George, author
Thomson Learning, 2001
Buku Teks
Ford Foundation , 1978
Buku Teks
edited by Herbert L. Marx
H.W. Wilson, 1962
Buku Teks
Burns, James McGregor, author
Prentice-Hall, 1972
Buku Teks