APA aipamena

Nelson, P. E. (2009). ISpeak. McGraw-Hill Higher Education.

Chicago Style aipamena

Nelson, Paul E. ISpeak. McGraw-Hill Higher Education, 2009.

MLA aipamena

Nelson, Paul E. ISpeak. McGraw-Hill Higher Education, 2009.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.