APA (7th ed.) Citation

Willis, J. R., Willis, D., & Walker, P. (1988). Collins Cobuild English course: Teacher's book 1. Collins.

Chicago Style (17th ed.) Citation

Willis, Jane R., Dave Willis, and Paula Walker. Collins Cobuild English Course: Teacher's Book 1. London: Collins, 1988.

MLA (8th ed.) Citation

Willis, Jane R., et al. Collins Cobuild English Course: Teacher's Book 1. Collins, 1988.