APA (7th ed.) Citation

Salkind, C. T., & Earl, J. M. (1961). The contest problem book. The Mathematical Association of America.

Chicago Style (17th ed.) Citation

Salkind, Charles T., and James M. Earl. The Contest Problem Book. Washington D.C.: The Mathematical Association of America, 1961.

MLA (8th ed.) Citation

Salkind, Charles T., and James M. Earl. The Contest Problem Book. The Mathematical Association of America, 1961.

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