APA (7th ed.) Citation

Yu, C. C. (2009). O-Level Science Physics Wxamination Notes. Good Books.

Chicago Style (17th ed.) Citation

Yu, Cheng Chung. O-Level Science Physics Wxamination Notes. Good Books, 2009.

MLA (8th ed.) Citation

Yu, Cheng Chung. O-Level Science Physics Wxamination Notes. Good Books, 2009.

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