APA (7th ed.) Citation

Ferree, Boyd, Sanabria, & Numrich. (1998). North Star: Focus on listerning and speaking. Longman.

Chicago Style (17th ed.) Citation

Ferree, Boyd, Sanabria, and Numrich. North Star: Focus on Listerning and Speaking. London: Longman, 1998.

MLA (8th ed.) Citation

Ferree, et al. North Star: Focus on Listerning and Speaking. Longman, 1998.