Gilbertson, N. J., Otten, S., Males, L. M., & Clark, D. L. (2013). Connecting Research to Practice: Reasoning-and proving opportunities in geometry textbooks. Mathematics Teacher, 107, 138-142.
For many American students, high school geometry provides their only focused experience in writing proofs (Herbst 2002), and proof is often viewed as the application of recently learned theorems rather than a means of establishing and understanding the truth of general results (Soucy McCrone and Martin 2009). This article provides an analysis of commonly used geometry textbooks and students' opportunities to learn to prove and reason with these texts.