Yaglom, A. M., Yaglom, I. M., & McCawley, J. (1967). Challenging mathematical problems with elementary solutions (Primera edición.). Dover.
Chicago Style (17th ed.) CitationYaglom, A. M., I. M. Yaglom, and James McCawley. Challenging Mathematical Problems with Elementary Solutions. Primera edición. New York: Dover, 1967.
MLA (9th ed.) CitationYaglom, A. M., et al. Challenging Mathematical Problems with Elementary Solutions. Primera edición. Dover, 1967.
Warning: These citations may not always be 100% accurate.