Lenchner, G., & Krulik, S. (1974). The overhead projector in the mathematics classroom. National Council of Teachers of Mathematics.
Chicago Style (17th ed.) CitationLenchner, George, and Stephen Krulik. The Overhead Projector in the Mathematics Classroom. Reston, VA: National Council of Teachers of Mathematics, 1974.
MLA (9th ed.) CitationLenchner, 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.