Cita APA

Soars, J., & Soars, L. (1989). Headway. London: Oxford university press.

Citación estilo Chicago

Soars, John, y Liz Soars. Headway. London: Oxford university press, 1989.

Cita MLA

Soars, John, y Liz Soars. Headway. London: Oxford university press, 1989.