Gaya APA

Heyworth, R, M., Briggs, J, G, R. (2007). Science In Focus Chemistry 'O' Level (Kedua). Singapura: Pearson Longman.

Gaya MLA

Heyworth, Rex, M.., Briggs, J., G., R.. "Science In Focus Chemistry 'O' Level". Kedua Singapura: Pearson Longman, 2007. Text.