Preiss, S. (1998). NorthStar: Focus on listening and speaking, advanced. Longman.
Chicago Style (17th ed.) CitationPreiss, Sherry. NorthStar: Focus on Listening and Speaking, Advanced. Nueva York: Longman, 1998.
MLA (9th ed.) CitationPreiss, Sherry. NorthStar: Focus on Listening and Speaking, Advanced. Longman, 1998.
Advarsel: Disse citationer er muligvist ikke 100% nøjagtige.