Gaya APA
Heyworth, R. (2007).
Chemistry Insights 'o' Level 2nd edition : Practical Workbook .
Singapore:
Pearson Longman.
Gaya MLA
Heyworth, Rex.M.
"Chemistry Insights 'o' Level 2nd edition : Practical Workbook".
Singapore:
Pearson Longman,
2007.
Text.