Cita APA (7a ed.)

Andreescu, T., & Gelca, R. (2009). Mathematical Olympiad Challenges (2nd ed. 2009.). Birkhäuser Boston : Imprint: Birkhäuser.

Cita Chicago Style (17a ed.)

Andreescu, Titu, y Razvan Gelca. Mathematical Olympiad Challenges. 2nd ed. 2009. Boston, MA: Birkhäuser Boston : Imprint: Birkhäuser, 2009.

Cita MLA (8a ed.)

Andreescu, Titu, y Razvan Gelca. Mathematical Olympiad Challenges. 2nd ed. 2009. Birkhäuser Boston : Imprint: Birkhäuser, 2009.