Παραπομπή σε μορφή APA (7η εκδ.)

Trim, J. L. M. (1980). Developing a unit/credit scheme of adult language learning ([2d] ed.). Published for and on behalf of the Council of Europe by Pergamon Press.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Trim, J. L. M. Developing a Unit/credit Scheme of Adult Language Learning. [2d] ed. Oxford ; New York: Published for and on behalf of the Council of Europe by Pergamon Press, 1980.

Παραπομπή σε μορφή MLA (9th εκδ.)

Trim, J. L. M. Developing a Unit/credit Scheme of Adult Language Learning. [2d] ed. Published for and on behalf of the Council of Europe by Pergamon Press, 1980.