APA (7th ed.) Citation

Davidson, G., & Sten, G. (2005). A student's companion: Vocabulary and grammar. Learners Publishing.

Chicago Style (17th ed.) Citation

Davidson, George, and George Sten. A Student's Companion: Vocabulary and Grammar. Singapore: Learners Publishing, 2005.

MLA (8th ed.) Citation

Davidson, George, and George Sten. A Student's Companion: Vocabulary and Grammar. Learners Publishing, 2005.