Gaya APA
Heyworth, R, M., Briggs, J, G, R. (2008).
Chemistry insights : 'O' level 2nd edition theory workbook .
Singapura:
Pearson Education.
Gaya MLA
Heyworth, Rex, M., Briggs, J, G, R.
"Chemistry insights : 'O' level 2nd edition theory workbook".
Singapura:
Pearson Education,
2008.
Text.