Παραπομπή σε μορφή APA (7η εκδ.)

Abbs, B., & Freebairn, I. Building strategies: An intergrated language cource for learnersof English (New ed.). Longman.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Abbs, Brian, και Ingrid Freebairn. Building Strategies: An Intergrated Language Cource for Learnersof English. New ed. Harlow: Longman.

Παραπομπή σε μορφή MLA (9th εκδ.)

Abbs, Brian, και Ingrid Freebairn. Building Strategies: An Intergrated Language Cource for Learnersof English. New ed. Longman.