Salkind, C. T., & Earl, J. M. (1973). The contest problem book III: Annual high school contests 1966-1972. [Washington]: The Mathematical Association of America.
Chicago Style CitationSalkind, Charles T., and James Mayberry Earl. The Contest Problem Book III: Annual High School Contests 1966-1972. [Washington]: The Mathematical Association of America, 1973.
MLA CitationSalkind, Charles T., and James Mayberry Earl. The Contest Problem Book III: Annual High School Contests 1966-1972. [Washington]: The Mathematical Association of America, 1973.
Warning: These citations may not always be 100% accurate.