Gaya APA
Math Puzzles and Brainteasers Grades 6 - 8
.
(2009).
San Fransnisco:
Jossey-Bass Teacher.
Gaya MLA
Math Puzzles and Brainteasers Grades 6 - 8
.
1.
San Fransnisco:
Jossey-Bass Teacher,
2009.
Buku.