APA (7th ed.) Citation

Watts, D. J. (2003). Six degrees: The science of a connected age (1. ed.). Norton.

Chicago Style (17th ed.) Citation

Watts, Duncan J. Six Degrees: The Science of a Connected Age. 1. ed. New York, NY: Norton, 2003.

MLA (9th ed.) Citation

Watts, Duncan J. Six Degrees: The Science of a Connected Age. 1. ed. Norton, 2003.