Swokowski, Earl W.
Functions and graphs/Earl W. swokowski
Prindle, Weber & Schmidt, 1984
 Buku Teks
Davis, Marsha J.
Precalculus in context: projects for the real world
Brooks/Cole Publishing, 1998
 Buku Teks
Dodge, Clayton W.
The circular functions
Prentice-Hall, 1966
 Buku Teks
Cohen, David
Precalculus with unit-circle trigonometry : interactive video skillbuilder CD-ROM
Brooks/Cole, Thomson, 2006
 Multimedia
Cohen, David
Precalculus : a problems-oriented approach : interactive video skillbuilder CD
Thomson, 2006
 Multimedia