Παραπομπή APA

Billows, F. L. (1961). Techniques of language teaching. Longmans.

Παραπομπή Chicago Style

Billows, F. L. Techniques of Language Teaching. Longmans, 1961.

Παραπομπή MLA

Billows, F. L. Techniques of Language Teaching. Longmans, 1961.