APA (7th ed.) Citation

Spencer, P. L., & Brydegraard, M. (1952). Building mathematical concepts in in the elementary school. Henry Holt and Comp.

Chicago Style (17th ed.) Citation

Spencer, Peter Lincoln., and Marguirete Brydegraard. Building Mathematical Concepts in in the Elementary School. Henry Holt and Comp, 1952.

MLA (8th ed.) Citation

Spencer, Peter Lincoln., and Marguirete Brydegraard. Building Mathematical Concepts in in the Elementary School. Henry Holt and Comp, 1952.

Warning: These citations may not always be 100% accurate.