Gaya APA
Stickels, T. (2009).
Math Puzzles and Brainteasers, Grades 6-8 Over 300 Reproducible Puzzles that Teach Math and Problem Solving (link download : https://id1lib.org/dl/608960/4f3b5).
USA:
Jossey-Bass.
Gaya MLA
Stickels, Terry.
"Math Puzzles and Brainteasers, Grades 6-8 Over 300 Reproducible Puzzles that Teach Math and Problem Solving".
link download : https://id1lib.org/dl/608960/4f3b5
USA:
Jossey-Bass,
2009.
Electronic Resource.