Cita APA

Abbs, B., Ayton, A., & Freebairn, I. (1975). Strategies: Integrated english language materials (1a. ed.). Longman.

Citación estilo Chicago

Abbs, Brian, Angela Ayton, and Ingrid Freebairn. Strategies: Integrated English Language Materials. 1a. ed. Essex: Longman, 1975.

Cita MLA

Abbs, Brian, et al. Strategies: Integrated English Language Materials. 1a. ed. Longman, 1975.