Cita APA (7a ed.)

Abbs, B., & Freebairn, I. (1980). Building Strategies: Strategies 2. Longman.

Cita Chicago Style (17a ed.)

Abbs, Brian, y Ingrid Freebairn. Building Strategies: Strategies 2. England: Longman, 1980.

Cita MLA (9a ed.)

Abbs, Brian, y Ingrid Freebairn. Building Strategies: Strategies 2. Longman, 1980.