Citazione Stile APA (7a Edizione)

Howatt, A. P. R. (1969). Programmed Learning and the Language Teacher. Longmans.

Citazione stile Chigago Style (17a edizione)

Howatt, Anthony P. R. Programmed Learning and the Language Teacher. Londres: Longmans, 1969.

Citatione MLA (9a ed.)

Howatt, Anthony P. R. Programmed Learning and the Language Teacher. Longmans, 1969.