APA (7th ed.) Citation

Lenchner, G., & Krulik, S. (1974). The overhead projector in the mathematics classroom. National Council of Teachers of Mathematics.

Chicago Style (17th ed.) Citation

Lenchner, George, and Stephen Krulik. The Overhead Projector in the Mathematics Classroom. Reston, VA: National Council of Teachers of Mathematics, 1974.

MLA (9th ed.) Citation

Lenchner, George, and Stephen Krulik. The Overhead Projector in the Mathematics Classroom. National Council of Teachers of Mathematics, 1974.

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