APA Style

Williams, M., Fricker, R. (2008). Challenges 2: Total teacher's pack (cet. 4). England: Pearson Longman Asia ELT.

MLA Style

Williams, Melanie., Fricker, Rod. "Challenges 2: Total teacher's pack". cet. 4 England: Pearson Longman Asia ELT, 2008. Buku SMP Athalia.