APA (7th ed.) Citation

(1980). The key to english: Two-word verbs. Collier Macmillan International.

Chicago Style (17th ed.) Citation

The Key to English: Two-word Verbs. London: Collier Macmillan International, 1980.

MLA (9th ed.) Citation

The Key to English: Two-word Verbs. Collier Macmillan International, 1980.