Gaya APA

Kristen, S, ,., Beuckens, T. (2009). Impact conversation 2 . Hongkong: Pearson Longman Asia ELT.

Gaya MLA

Kristen, Sullivan, ,., Beuckens, Todd. "Impact conversation 2". Hongkong: Pearson Longman Asia ELT, 2009. Umum.