Cita APA (7a ed.)

Soars, L., & Soars, J. (1993). Headway. Workbook: Elementary (2a. ed.). Oxford University.

Cita Chicago Style (17a ed.)

Soars, Liz, y John Soars. Headway. Workbook: Elementary. 2a. ed. Oxford: Oxford University, 1993.

Cita MLA (9a ed.)

Soars, Liz, y John Soars. Headway. Workbook: Elementary. 2a. ed. Oxford University, 1993.