Kettell, Brian, author
John Wiley & Sons, 2010
Buku Teks
by William B. Lockhart ... [and others]
West Publishing Company, 1975
Buku Teks
Shiffrin, Steven H., author
West, 2011
Buku Teks
Dayaratnam, P., author
Tata McGraw-Hill, 1983
Buku Teks
Elonka, Stephen Michael
McGraw-Hill, 1981
Buku Referensi