APA (7th ed.) Citation

Frazier, Mills, Boyd, & Carol. (1998). North star: Focus on listening and speaking basic. Longman.

Chicago Style (17th ed.) Citation

Frazier, Mills, Boyd, and Carol. North Star: Focus on Listening and Speaking Basic. London: Longman, 1998.

MLA (8th ed.) Citation

Frazier, et al. North Star: Focus on Listening and Speaking Basic. Longman, 1998.