APA Style
Guok, Dorcas. (2009).
Challenging mathematics problems: Secondary express 2 .
Singapore:
Educational Publishing House Pte Ltd.
Chicago Style
Guok, Dorcas.
Challenging mathematics problems: Secondary express 2.
Singapore:
Educational Publishing House Pte Ltd,
2009.
Text.
MLA Style
Guok, Dorcas.
Challenging mathematics problems: Secondary express 2.
Singapore:
Educational Publishing House Pte Ltd,
2009.
Text.
Turabian Style
Guok, Dorcas.
Challenging mathematics problems: Secondary express 2.
Singapore:
Educational Publishing House Pte Ltd,
2009.
Print.