APA
(1988). Learning and teaching geometry, K - 12. Reston: The National Council of Teachers of Mathematics.
Chicago
1988. Learning and teaching geometry, K - 12. Reston: The National Council of Teachers of Mathematics.
Harvard
(1988). Learning and teaching geometry, K - 12. Reston: The National Council of Teachers of Mathematics.
MLA
Learning and teaching geometry, K - 12. Reston: The National Council of Teachers of Mathematics. 1988.