Cita APA (7th ed.)
Abbs, B., & Freebairn, I. (1989). Blueprint intermediate: Student's book. Longman.
Cita Chicago (17th ed.)
Abbs, Brian, i Ingrid Freebairn. Blueprint Intermediate: Student's Book. England: Longman, 1989.
Cita MLA (9th ed.)
Abbs, Brian, i Ingrid Freebairn. Blueprint Intermediate: Student's Book. Longman, 1989.
Atenció: Aquestes cites poden no estar 100% correctes.