APA Style

Williams, M., Fricker, R. (2008). Challenges: total teacher's pack 4 (cet. 2). England: Pearson Education Limitted.

MLA Style

Williams, Melanie., Fricker, Rod. "Challenges: total teacher's pack 4". cet. 2 England: Pearson Education Limitted, 2008. Buku SMP Athalia.