APA (7th ed.) Citation

Obee, B. Cambridge First Certificate grammar and usage. Univ. Pr.

Chicago Style (17th ed.) Citation

Obee, Bob. Cambridge First Certificate Grammar and Usage. Cambridge: Univ. Pr.

MLA (9th ed.) Citation

Obee, Bob. Cambridge First Certificate Grammar and Usage. Univ. Pr.

Warning: These citations may not always be 100% accurate.