APA Style
Er, Andrew. (2011).
Mathematics Challenging Problems Primary 6 .
Singapore:
Educational Publishing House.
Chicago Style
Er, Andrew.
Mathematics Challenging Problems Primary 6.
Singapore:
Educational Publishing House,
2011.
Text.
MLA Style
Er, Andrew.
Mathematics Challenging Problems Primary 6.
Singapore:
Educational Publishing House,
2011.
Text.
Turabian Style
Er, Andrew.
Mathematics Challenging Problems Primary 6.
Singapore:
Educational Publishing House,
2011.
Print.