Gaya APA

Kisslinger, E., Beuekens, T. (2009). Impac listening 1 (Ed. 2). Hongkong: Pearson Longman Asia ELT.

Gaya MLA

Kisslinger, Ellen., Beuekens, Todd. "Impac listening 1". Ed. 2 Hongkong: Pearson Longman Asia ELT, 2009. Umum.