Παραπομπή σε μορφή APA (7η εκδ.)

Abbs, B., & Freebairn, I. (1980). Developing strategies: An intergrated language cource for intermediate students. Longman.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Abbs, Brian, και Ingrid Freebairn. Developing Strategies: An Intergrated Language Cource for Intermediate Students. Harlow: Longman, 1980.

Παραπομπή σε μορφή MLA (9th εκδ.)

Abbs, Brian, και Ingrid Freebairn. Developing Strategies: An Intergrated Language Cource for Intermediate Students. Longman, 1980.