APA (7th ed.) Citation

Chua, S. L. (1995). 21st century mathematics. Fourth year. Phoenix.

Chicago Style (17th ed.) Citation

Chua, Simon L. 21st Century Mathematics. Fourth Year. Quezon City: Phoenix, 1995.

MLA (9th ed.) Citation

Chua, Simon L. 21st Century Mathematics. Fourth Year. Phoenix, 1995.

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