APA (7th ed.) Citation

Guo, S. (2007). Why? To learn math = Why mathematics? (Chinese). Sea Pigeon Culture.

Chicago Style (17th ed.) Citation

Guo, Song. Why? To Learn Math = Why Mathematics? (Chinese). Taibei: Sea Pigeon Culture, 2007.

MLA (9th ed.) Citation

Guo, Song. Why? To Learn Math = Why Mathematics? (Chinese). Sea Pigeon Culture, 2007.

Warning: These citations may not always be 100% accurate.