Eccles, William J., author
Addison-Wesley Pub., 1985
Buku Teks
Dollhoff, Terry, author
Reston Pub., 1979
Buku Teks
Paterson, John, author
John Wiley & Sons, 1980
Buku Teks
Andrews, Michael, 1940-
Buku Teks
Andrews, Michael, author
Prentice-Hall, 1982
Buku Teks