Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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