APA Style

Wan, A, C, H. (2006). Challenging maths problems made easy: A step-by-step guide to the non-routine . Singapore: Marshall Cavendish Education.

MLA Style

Wan, Ammiel, Chee, Hong. "Challenging maths problems made easy: A step-by-step guide to the non-routine". Singapore: Marshall Cavendish Education, 2006. Text.