Gaya APA

Yong, L, W. (2007). Science In Focus Physics 'O' Level. 2nd Edition . Singapore: Pearson Education South Asia Pte Ltd.

Gaya MLA

Yong, Loo, Wan. "Science In Focus Physics 'O' Level. 2nd Edition". Singapore: Pearson Education South Asia Pte Ltd, 2007. Text.