Dollhoff, Terry, author
Reston Pub., 1979
Buku Teks
Eccles, William J., author
Addison-Wesley Pub., 1985
Buku Teks
Byrd, Joseph S., author
Prentice Hall International, 1993
Buku Teks
Ghani, Noordin, author
Research Study Press, 1980
Buku Teks
Paterson, John, author
John Wiley & Sons, 1980
Buku Teks