APA (7th ed.) Citation

Billows, F. (1973). The Techniques of language teaching (6a reimpr. de la 1a ed. de 1961.). Longman.

Chicago Style (17th ed.) Citation

Billows, F.L. The Techniques of Language Teaching. 6a reimpr. de la 1a ed. de 1961. London: Longman, 1973.

MLA (9th ed.) Citation

Billows, F.L. The Techniques of Language Teaching. 6a reimpr. de la 1a ed. de 1961. Longman, 1973.