(2013). English for Academic Purposes. Penerbit Andi.
Chicago Style aipamenaEnglish for Academic Purposes. Penerbit Andi, 2013.
MLA aipamenaEnglish for Academic Purposes. Penerbit Andi, 2013.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.
APA aipamena