Cita APA (7a ed.)

Abbs, B., & Freebairn, I. (1993). Blueprint Two: Students book (9a. ed.). Longman.

Cita Chicago Style (17a ed.)

Abbs, Brian, y Ingrid Freebairn. Blueprint Two: Students Book. 9a. ed. Londres: Longman, 1993.

Cita MLA (8a ed.)

Abbs, Brian, y Ingrid Freebairn. Blueprint Two: Students Book. 9a. ed. Longman, 1993.