APA Style
Er, Andrew. (2007).
Mathematics Challenging Problems Primary 1 .
Singapore:
Educational Publishing House.
Chicago Style
Er, Andrew.
Mathematics Challenging Problems Primary 1.
Singapore:
Educational Publishing House,
2007.
Text.
MLA Style
Er, Andrew.
Mathematics Challenging Problems Primary 1.
Singapore:
Educational Publishing House,
2007.
Text.
Turabian Style
Er, Andrew.
Mathematics Challenging Problems Primary 1.
Singapore:
Educational Publishing House,
2007.
Print.