APA (7th ed.) Citation

WILLIS, D. (1993). Collins cobuild students grammar. Harper collins.

Chicago Style (17th ed.) Citation

WILLIS, Dave. Collins Cobuild Students Grammar. Harper collins, 1993.

MLA (8th ed.) Citation

WILLIS, Dave. Collins Cobuild Students Grammar. Harper collins, 1993.

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