APA (7th ed.) Citation

BARKER, C. (2001). Boost Your Vocabulary 1. Penguin Books Ltd.

Chicago Style (17th ed.) Citation

BARKER, Chris. Boost Your Vocabulary 1. Penguin Books Ltd, 2001.

MLA (8th ed.) Citation

BARKER, Chris. Boost Your Vocabulary 1. Penguin Books Ltd, 2001.

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