APA Style

Leong, O, H., Aik, E, A, J. (2006). Chemistry Expression an Inquiry Approach Practical Workbook O Level Science (Chemistry) . Singapore: EPB Pan Pacific.

MLA Style

Leong, Oon, Hock., Aik, Edmund, Ang, Joon. "Chemistry Expression an Inquiry Approach Practical Workbook O Level Science (Chemistry)". Singapore: EPB Pan Pacific, 2006. Text.