APA (7th ed.) Citation

Ellis, A. B., Bieda, K., & Knuth, E. J. (2012). Developing essential understanding of proof and proving for teaching mathematics in grades 9-12. The National Council of Teachers of Mathematics, Inc..

Chicago Style (17th ed.) Citation

Ellis, Amy B., Kristen Bieda, and Eric J. Knuth. Developing Essential Understanding of Proof and Proving for Teaching Mathematics in Grades 9-12. Reston, VA: The National Council of Teachers of Mathematics, Inc., 2012.

MLA (8th ed.) Citation

Ellis, Amy B., et al. Developing Essential Understanding of Proof and Proving for Teaching Mathematics in Grades 9-12. The National Council of Teachers of Mathematics, Inc., 2012.