Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

Solórzano, Helen S., y Jennifer P. L. Schmidt. NorthStar: Focus on Listening and Speaking: Intermediate. New York: Longman, 1998.

Cita MLA (8a ed.)

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