Cita APA (7a ed.)

Abbs, B., & Freebairn, I. (1992). Blueprint One: Students book (4a. ed.). Longman.

Cita Chicago Style (17a ed.)

Abbs, Brian, y Ingrid Freebairn. Blueprint One: Students Book. 4a. ed. Londres: Longman, 1992.

Cita MLA (8a ed.)

Abbs, Brian, y Ingrid Freebairn. Blueprint One: Students Book. 4a. ed. Longman, 1992.