Gaya APA
Heyworth, R, M. (2007).
Longman : Effective Guide To 0 Level Chemistry = 3rd Edition .
Singapore:
Pearson Education South Asia.
Gaya MLA
Heyworth, Rex, M.
"Longman : Effective Guide To 0 Level Chemistry = 3rd Edition".
Singapore:
Pearson Education South Asia,
2007.
Book.