APA Style
Keng, S, T., Cheng, Y, L. (2011).
Mathematics 1: New Syllabus, 6th edition (6th edition).
Singapore:
Shinglee Publishers.
MLA Style
Keng, Seng, Teh., Cheng, Yee, Loh.
"Mathematics 1: New Syllabus, 6th edition".
6th edition
Singapore:
Shinglee Publishers,
2011.
Textbook.