Meckler, Milton
McGraw-Hill, 1980
Buku Teks
Baron, Stephen L., editor
Prentice-Hall, 1978
Buku Referensi
Littler, John
Cambridge University Press, 1984
Buku Teks
Dubin, Fred S., author
McGraw-Hill, 1978
Buku Teks
edited by H. Ehringer and U. Zito
D. Reidel, 1984
Buku Teks