Cita APA (7a ed.)

Abbs, B., & Freebairn, I. (1985). Building Strategies. Students' Book. Strategies 2. Longman.

Cita Chicago Style (17a ed.)

Abbs, Brian, y Ingrid Freebairn. Building Strategies. Students' Book. Strategies 2. Essex: Longman, 1985.

Cita MLA (9a ed.)

Abbs, Brian, y Ingrid Freebairn. Building Strategies. Students' Book. Strategies 2. Longman, 1985.