Gaya APA
Heyworth, R, M.
(2007).
Chemistry Insights 'O' Level : Practical Workbook
.
Singapura:
Pearson Education.
Gaya MLA
Heyworth, Rex, M..
"Chemistry Insights 'O' Level : Practical Workbook".
Singapura:
Pearson Education,
2007.
Text.