Cita APA (7a ed.)

Soars, J., & Soars, L. (1998). Headway: Student's book : elementary. Oxford University.

Cita Chicago Style (17a ed.)

Soars, John, y Liz Soars. Headway: Student's Book : Elementary. Oxford: Oxford University, 1998.

Cita MLA (9a ed.)

Soars, John, y Liz Soars. Headway: Student's Book : Elementary. Oxford University, 1998.