APA (7th ed.) Citation

Chen, J., Chen, S., & Chen, G. (2012). Fifty lectures for American mathematics competitions. mymathcounts.com.

Chicago Style (17th ed.) Citation

Chen, Jane, Sam Chen, and Guiling Chen. Fifty Lectures for American Mathematics Competitions. [United States]: mymathcounts.com, 2012.

MLA (9th ed.) Citation

Chen, Jane, et al. Fifty Lectures for American Mathematics Competitions. mymathcounts.com, 2012.