Gaya APA
Varberg, W, F, D, D.
(1988).
College Algebra A Problem-Solving Approach
(
ed.3)
.
America:
Prentice Hall.
Gaya MLA
Varberg, Walter, Fleming, Dan, Dale.
"College Algebra A Problem-Solving Approach".
ed.3
America:
Prentice Hall,
1988.
Text.