Citazione Stile APA (7a Edizione)

Gatenby, E. V. (1966). A Direct method english course: Teacher's book two. Longmans.

Citazione stile Chigago Style (17a edizione)

Gatenby, E. V. A Direct Method English Course: Teacher's Book Two. London: Longmans, 1966.

Citatione MLA (9a ed.)

Gatenby, E. V. A Direct Method English Course: Teacher's Book Two. Longmans, 1966.