Gaya APA

Lenchner, G., Richard, I, K. (2008). Math olympiad contest problems vol. 2 . New York: New York: Bellmore, 2008.

Gaya MLA

Lenchner, George., Richard, I, Kalman,. "Math olympiad contest problems vol. 2". New York: New York: Bellmore, 2008, 2008. .