Cita APA

Greenbaum, S., & Whitcut, J. (1996). Longman guide to english usage. London: Penguin Books.

Citación estilo Chicago

Greenbaum, Sidney, and Janet Whitcut. Longman Guide to English Usage. London: Penguin Books, 1996.

Cita MLA

Greenbaum, Sidney, and Janet Whitcut. Longman Guide to English Usage. London: Penguin Books, 1996.