Gaya APA

Day, R, R. et al (2009). Impact issues 3 – 20 stimulating issuesnfor discussion and debate in English (Ed. 2). Hongkong: Pearson Longman Asia ELT.

Gaya MLA

Day, Richard, R.. et al. "Impact issues 3 – 20 stimulating issuesnfor discussion and debate in English". Ed. 2 Hongkong: Pearson Longman Asia ELT, 2009. Umum.