Gaya APA
Andreescu, T., Feng, Z. (2005).
103 Trigonometry Problems: From the Training of the USA IMO Team .
Amerika:
Birkhauser.
Gaya MLA
Andreescu, Titu., Feng, Zuming.
"103 Trigonometry Problems: From the Training of the USA IMO Team".
Amerika:
Birkhauser,
2005.
Text.