APA (7th ed.) Citation

Clifford, P., & Clifford, R. (2007). Self-normalised distance with don't cares.

Chicago Style (17th ed.) Citation

Clifford, P., and R. Clifford. Self-normalised Distance with Don't Cares. 2007.

MLA (9th ed.) Citation

Clifford, P., and R. Clifford. Self-normalised Distance with Don't Cares. 2007.