APA (7th ed.) Citation

Ferree, T., Sanabria, K., Boyd, F. A., & Numrich, C. (1999). Northstar: Focus on listening and speaking : high intermediate. Teacher's manual. Longman.

Chicago Style (17th ed.) Citation

Ferree, Tess, Kim Sanabria, Frances Armstrong Boyd, and Carol Numrich. Northstar: Focus on Listening and Speaking : High Intermediate. Teacher's Manual. New York: Longman, 1999.

MLA (9th ed.) Citation

Ferree, Tess, et al. Northstar: Focus on Listening and Speaking : High Intermediate. Teacher's Manual. Longman, 1999.