Schnell, L. H., & Crawford, M. (1938). Clear thinking : an approach through plane geometry / by L.H. Schnell and M. Crawford: An approach through plane geometry. Harper.
Chicago Edition CitationSchnell, L. H., and M. Crawford. Clear Thinking : An Approach Through Plane Geometry / by L.H. Schnell and M. Crawford: An Approach Through Plane Geometry. Harper, 1938.
MLA Edition CitationSchnell, L. H., and M. Crawford. Clear Thinking : An Approach Through Plane Geometry / by L.H. Schnell and M. Crawford: An Approach Through Plane Geometry. Harper, 1938.
Warning: These citations may not always be 100% accurate.