APA (7th ed.) Citation

Chen, G., & Chen, Y. (2013). Fifty lectures for American mathematics competitions. mymathcounts.com.

Chicago Style (17th ed.) Citation

Chen, Guiling, and Yongcheng Chen. Fifty Lectures for American Mathematics Competitions. [United States]: mymathcounts.com, 2013.

MLA (9th ed.) Citation

Chen, Guiling, and Yongcheng Chen. Fifty Lectures for American Mathematics Competitions. mymathcounts.com, 2013.

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