APA (7th ed.) Citation

Sneath, P. H., & Sokal, R. R. (1973). Numerical taxonomy: The principles and practice of numerical classification. Freeman.

Chicago Style (17th ed.) Citation

Sneath, Peter H., and Robert R. Sokal. Numerical Taxonomy: The Principles and Practice of Numerical Classification. San Francisco: Freeman, 1973.

MLA (9th ed.) Citation

Sneath, Peter H., and Robert R. Sokal. Numerical Taxonomy: The Principles and Practice of Numerical Classification. Freeman, 1973.