Gaya APA

Hwa, K, S. (2010). Science 4A: Activity Book Int Edt (4A SD International Edition). Singapore: Federal Marshall Cavendish Education.

Gaya MLA

Hwa, Kwa, Siew. "Science 4A: Activity Book Int Edt". 4A SD International Edition Singapore: Federal Marshall Cavendish Education, 2010. .