Purves, William K.
The Mona GrOup LLC, 1998
Multimedia
Belk, Collen
Pearson/Benjamin Cummings, 2008
Buku Teks
Belk, Collen
Pearson Prentice Hall, 2007
Multimedia
Rahn, Joan E.
Macmillan, 1974
Buku Teks
Branley, Franklyn M.
Ginn and Company, 1965
Buku Teks