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