Cita APA (7a ed.)

Downing, A., & Locke, P. (2002). A university course in English grammar. Routledge.

Cita Chicago Style (17a ed.)

Downing, Angela, y Philip Locke. A University Course in English Grammar. London: Routledge, 2002.

Cita MLA (8a ed.)

Downing, Angela, y Philip Locke. A University Course in English Grammar. Routledge, 2002.