APA (7th ed.) Citation

Sokal, R. R., & Sneath, P. H. (1963). Principles of numerical taxonomy. Freeman.

Chicago Style (17th ed.) Citation

Sokal, Robert R., and Peter H.A Sneath. Principles of Numerical Taxonomy. San Francisco [etc.]: Freeman, 1963.

MLA (9th ed.) Citation

Sokal, Robert R., and Peter H.A Sneath. Principles of Numerical Taxonomy. Freeman, 1963.