APA Style
Leong, O, H., Aik, E, A, J. (2006).
Chemistry Expression: Theory Workbook 'O' Level Science .
Singapore:
EPB Pan Pacific.
MLA Style
Leong, Oon, Hock., Aik, Edmund, Ang, Joon.
"Chemistry Expression: Theory Workbook 'O' Level Science".
Singapore:
EPB Pan Pacific,
2006.
Text.