APA (7th ed.) Citation

(1978). Problem-solving in geometry (2. print.). National Council of Teachers of Mathematics.

Chicago Style (17th ed.) Citation

Problem-solving in Geometry. 2. print. Reston: National Council of Teachers of Mathematics, 1978.

MLA (9th ed.) Citation

Problem-solving in Geometry. 2. print. National Council of Teachers of Mathematics, 1978.