Cita APA (7a ed.)

Greenbaum, S., & Whitcut, J. (1988). Longman guide to english usage. Longman.

Cita Chicago Style (17a ed.)

Greenbaum, Sidney, y Janet Whitcut. Longman Guide to English Usage. Harlow: Longman, 1988.

Cita MLA (8a ed.)

Greenbaum, Sidney, y Janet Whitcut. Longman Guide to English Usage. Longman, 1988.