Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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