Hadley, G., author
Addison-Wesley, 1962
Buku Teks
Gass, Saul I., author
Mc Graw Hill, 1975
Buku Teks
Nesa, Wu, author
McGraw-Hill, 1981
Buku Teks
Ignizio, James P., author
Sage, 1985
Buku Teks
Feiring, Bruce R., author
Sage University Paper, 1986
Buku Teks