Belk, Collen
Pearson - Benjamin Cummings, 2008
Buku Teks
Belk, Collen, author
Pearson Prentice Hall, 2007
Multimedia
Purves, William K., author
The Mona GrOup LLC, 1998
Multimedia
Rahn, Joan E., author
Macmillan, 1974
Buku Teks
by William K. Purves ... [et.al.]
W.H. Freeman, 1997
Buku Teks