APA (7th ed.) Citation

Solórzano, h. S., & Schmidt, J. P. L. (1998). NorthStar: Focus on listening and speaking, intermediate. Longman.

Chicago Style (17th ed.) Citation

Solórzano, helen S., and Jennifer P. L. Schmidt. NorthStar: Focus on Listening and Speaking, Intermediate. Nueva York: Longman, 1998.

MLA (9th ed.) Citation

Solórzano, helen S., and Jennifer P. L. Schmidt. NorthStar: Focus on Listening and Speaking, Intermediate. Longman, 1998.