Gaya APA
Yong, L, W.
(2007).
Chemistry insight 'o' level 2nd edition theory workbook
.
Singapore:
Pearson Longman.
Gaya MLA
Yong, Loo, Wan.
"Chemistry insight 'o' level 2nd edition theory workbook".
Singapore:
Pearson Longman,
2007.
Text.