APA (7th ed.) Citation

Leech, J., & Newman, D. J. (1969). How to use groups. fig.

Chicago Style (17th ed.) Citation

Leech, J.W, and D. J. Newman. How to Use Groups. [S.l.]: fig, 1969.

MLA (8th ed.) Citation

Leech, J.W, and D. J. Newman. How to Use Groups. fig, 1969.