Cita APA (7a ed.)
Abbs, B., & Freebairn, I. Blueprint: Upper-Intermediate : Students' Book. Longman.
Cita estilo Chicago (17a ed.)
Abbs, Brian, y Ingrid Freebairn. Blueprint: Upper-Intermediate : Students' Book. Essex, Inglaterra: Longman.
Cita MLA (9a ed.)
Abbs, Brian, y Ingrid Freebairn. Blueprint: Upper-Intermediate : Students' Book. Longman.
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