Gaya APA

Yan, Y, S., Eng, H, L. (2000). Effective Skills:For "O" Level English (Cet. 1). Singapore: Federal Publication.

Gaya MLA

Yan, Yeo, Seok., Eng, Hui, Low. "Effective Skills:For "O" Level English". Cet. 1 Singapore: Federal Publication, 2000. Text.