Gaya APA
Heyworth, Rex.M. (2007).
CHEMISTRY INSIGHTS 'O' LEVEL 2nd EDITION .
Singapore:
pearson longman.
Gaya Chicago
Heyworth, Rex.M.
CHEMISTRY INSIGHTS 'O' LEVEL 2nd EDITION.
Singapore:
pearson longman,
2007.
Text.
Gaya MLA
Heyworth, Rex.M.
CHEMISTRY INSIGHTS 'O' LEVEL 2nd EDITION.
Singapore:
pearson longman,
2007.
Text.
Gaya Turabian
Heyworth, Rex.M.
CHEMISTRY INSIGHTS 'O' LEVEL 2nd EDITION.
Singapore:
pearson longman,
2007.
Print.