APA (7th ed.) Citation

Gatenby, E. V. (1972). A direct method english course. Longman.

Chicago Style (17th ed.) Citation

Gatenby, E. V. A Direct Method English Course. London: Longman, 1972.

MLA (9th ed.) Citation

Gatenby, E. V. A Direct Method English Course. Longman, 1972.