APA (7th ed.) Citation

Obee, B., & Evans, V. (2013). CPE practice tests 1: Student's book. Express Publishing.

Chicago Style (17th ed.) Citation

Obee, Bob, and Virginia Evans. CPE Practice Tests 1: Student's Book. Newbury: Express Publishing, 2013.

MLA (9th ed.) Citation

Obee, Bob, and Virginia Evans. CPE Practice Tests 1: Student's Book. Express Publishing, 2013.