APA (7th ed.) Citation

Leech, J. W., & Newman, D. J. (1969). How to use Groups. Methuen and Co. Ltd.

Chicago Style (17th ed.) Citation

Leech, J. W., and D. J. Newman. How to Use Groups. Londres: Methuen and Co. Ltd, 1969.

MLA (9th ed.) Citation

Leech, J. W., and D. J. Newman. How to Use Groups. Methuen and Co. Ltd, 1969.