Παραπομπή σε μορφή APA (7η εκδ.)

Abbs, B., & Freebairn, I. (1992). Blueprint intermediate: Students' book (1st ed., 8th impression.). Longman.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Abbs, Brian, και Ingrid Freebairn. Blueprint Intermediate: Students' Book. 1st ed., 8th impression. Harlow, Essex: Longman, 1992.

Παραπομπή σε μορφή MLA (9th εκδ.)

Abbs, Brian, και Ingrid Freebairn. Blueprint Intermediate: Students' Book. 1st ed., 8th impression. Longman, 1992.