Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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