APA Style

Harrison, W, T. (2014). New Challenges: Students' Book 4 (Jil.4). New York: Pearson Longman Asia ELT.

MLA Style

Harrison, Walter, T.. "New Challenges: Students' Book 4". Jil.4 New York: Pearson Longman Asia ELT, 2014. Buku SMP Athalia.