Cita APA

Andreescu, T., & Feng, Z. (2004). 103 trigonometry problems.

Chicago Edition Citation

Andreescu, Titu, i Zuming Feng. 103 Trigonometry Problems. Birkhauser, Boston, 2004.

Cita MLA

Andreescu, Titu, i Zuming Feng. 103 Trigonometry Problems. 2004.