Schroeder, W. L.
John Wiley & Sons, 1984
Buku Teks
Liu, Cheng
Pearson/Prentice Hall, 2005
Buku Teks
Liu, Cheng
Prentice-Hall, 1981
Buku Teks
Pavlik, Cheryl
[publisher not identified], [date of publication not identified]
Buku Teks
Ellis, S
Routledge, 1995
Buku Teks