APA (7th ed.) Zitazioa

Preiss, S. (1998). NorthStar: Focus on listening and speaking, advanced. Longman.

Chicago Style (17th ed.) Zitazioa

Preiss, Sherry. NorthStar: Focus on Listening and Speaking, Advanced. Nueva York: Longman, 1998.

MLA (9th ed.) Zitazioa

Preiss, Sherry. NorthStar: Focus on Listening and Speaking, Advanced. Longman, 1998.