Gaya APA
Heyworth, R, M. (2008).
New Science Discovery For Lower Secondary 2nd edition: Practical Workbook 1 .
Singapore:
Pearson Education.
Gaya MLA
Heyworth, Rex, M.
"New Science Discovery For Lower Secondary 2nd edition: Practical Workbook 1".
Singapore:
Pearson Education,
2008.
Text.