APA (7th ed.) Citation

Soars, J., & Soars, L. (1989). Headway: Advanced : student's book. Oxford University.

Chicago Style (17th ed.) Citation

Soars, John, and Liz Soars. Headway: Advanced : Student's Book. Oxford: Oxford University, 1989.

MLA (9th ed.) Citation

Soars, John, and Liz Soars. Headway: Advanced : Student's Book. Oxford University, 1989.