APA (7th ed.) Citation

Gatenby, E. V. (1960). A direct method english course (2nd ed.). Longman.

Chicago Style (17th ed.) Citation

Gatenby, E. V. A Direct Method English Course. 2nd ed. London: Longman, 1960.

MLA (9th ed.) Citation

Gatenby, E. V. A Direct Method English Course. 2nd ed. Longman, 1960.