Παραπομπή APA

Andreescu, T., & Gelca, R. (2010). Mathematical olympiad challenges. Springer.

Παραπομπή Chicago Style

Andreescu, Titu, και Razvan Gelca. Mathematical Olympiad Challenges. New Delhi: Springer, 2010.

Παραπομπή MLA

Andreescu, Titu, και Razvan Gelca. Mathematical Olympiad Challenges. Springer, 2010.