Cita APA (7a ed.)

O'Neill, R., Duckworth, M., & Gude, K. (1993). Success at first certificate. Oxford University Press.

Cita Chicago Style (17a ed.)

O'Neill, Robert, Michael Duckworth, y Kathy Gude. Success at First Certificate. Oxford: Oxford University Press, 1993.

Cita MLA (8a ed.)

O'Neill, Robert, et al. Success at First Certificate. Oxford University Press, 1993.