Παραπομπή σε μορφή APA (7η εκδ.)

Crammer, D. (1996). Motivating High level learners: Activities for upper intermediate and advanced learners. Addison Wesley Longman Limited.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Crammer, David. Motivating High Level Learners: Activities for Upper Intermediate and Advanced Learners. Essex: Addison Wesley Longman Limited, 1996.

Παραπομπή σε μορφή MLA (9th εκδ.)

Crammer, David. Motivating High Level Learners: Activities for Upper Intermediate and Advanced Learners. Addison Wesley Longman Limited, 1996.