APA (7th ed.) Citation

Willis, D. (1991). Collins COBUILD student's grammar. Harper-Collins.

Chicago Style (17th ed.) Citation

Willis, Dave. Collins COBUILD Student's Grammar. London: Harper-Collins, 1991.

MLA (9th ed.) Citation

Willis, Dave. Collins COBUILD Student's Grammar. Harper-Collins, 1991.

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