Cita APA (7a ed.)

Abbs, B., & Freebairn, I. (1979). Building strategies: An integrated course for learners of english. Longman.

Cita Chicago Style (17a ed.)

Abbs, Brian, y Ingrid Freebairn. Building Strategies: An Integrated Course for Learners of English. Londres: Longman, 1979.

Cita MLA (9a ed.)

Abbs, Brian, y Ingrid Freebairn. Building Strategies: An Integrated Course for Learners of English. Longman, 1979.