Cita APA (7a ed.)

Newbold, D., Greenall, S., & Garton-Sprenger, J. (1991). First certificate network. Heinemann.

Cita Chicago Style (17a ed.)

Newbold, David, Simon Greenall, y Judy Garton-Sprenger. First Certificate Network. Oxford: Heinemann, 1991.

Cita MLA (8a ed.)

Newbold, David, et al. First Certificate Network. Heinemann, 1991.