APA (7th ed.) Citation

Clifford, H. T., & New York Stephenson, W. An Introduction to numerical classification.

Chicago Style (17th ed.) Citation

Clifford, H. T., and William New York Stephenson. An Introduction to Numerical Classification.

MLA (9th ed.) Citation

Clifford, H. T., and William New York Stephenson. An Introduction to Numerical Classification.

Warning: These citations may not always be 100% accurate.