APA (7th ed.) Citation

Zhao, Y., & Kuan, T. H. B. (2011). O-Level algebra question generator--part D.

Chicago Style (17th ed.) Citation

Zhao, Yuelong, and Tan Hee Beng Kuan. O-Level Algebra Question Generator--part D. 2011.

MLA (9th ed.) Citation

Zhao, Yuelong, and Tan Hee Beng Kuan. O-Level Algebra Question Generator--part D. 2011.

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