MLA

Andreescu, Titu, Dorin Andrica, and Zuming Feng. 104 Number Theory Problems. Birkhäuser Boston, 2007.

APA

Andreescu, T., Andrica, D., & Feng, Z. (2007). 104 Number Theory Problems. Birkhäuser Boston.

Chicago

Andreescu, Titu, Dorin Andrica, and Zuming Feng. 104 Number Theory Problems. : Birkhäuser Boston, 2007.