Cita APA (7a ed.)
Abbs, B., & Freebairn, I. Blueprint: Intermediate : Teacher's Book. Longman.
Cita estilo Chicago (17a ed.)
Abbs, Brian, y Ingrid Freebairn. Blueprint: Intermediate : Teacher's Book. Essex, Inglaterra: Longman.
Cita MLA (9a ed.)
Abbs, Brian, y Ingrid Freebairn. Blueprint: Intermediate : Teacher's Book. Longman.
Precaución: Estas citas no son 100% exactas.