Cita APA (7a ed.)

Abbs, B., & Freebairn, I. (1997). Blueprint one (20a. ed.). Longman.

Cita Chicago Style (17a ed.)

Abbs, Brian, y Ingrid Freebairn. Blueprint One. 20a. ed. Essex: Longman, 1997.

Cita MLA (9a ed.)

Abbs, Brian, y Ingrid Freebairn. Blueprint One. 20a. ed. Longman, 1997.