Cita APA (7a ed.)

Abbs, B., & Freebairn, I. (1990). Blueprint One: Teachers book (3a. ed.). Longman.

Cita Chicago Style (17a ed.)

Abbs, Brian, y Ingrid Freebairn. Blueprint One: Teachers Book. 3a. ed. Londres: Longman, 1990.

Cita MLA (9a ed.)

Abbs, Brian, y Ingrid Freebairn. Blueprint One: Teachers Book. 3a. ed. Longman, 1990.