Gaya APA
Lappan, G., Phung, P. (1998).
Variables and Patterns: Introducing Algebra .
California:
Dale Seymour Publications.
Gaya MLA
Lappan, Glenda., Phung, Pauline.
"Variables and Patterns: Introducing Algebra".
California:
Dale Seymour Publications,
1998.
Text.