Cita APA (7a ed.)

Hopkins, A., & Tribble, C. (1990). Outlines. Longman.

Cita Chicago Style (17a ed.)

Hopkins, Andy, y Chris Tribble. Outlines. Essex, England: Longman, 1990.

Cita MLA (8a ed.)

Hopkins, Andy, y Chris Tribble. Outlines. Longman, 1990.