Kleinfeld, Judith (March 2002). "Six Degrees: Urban Myth?". Psychology Today. Sussex Publishers, LLC. Retrieved June 15, 2011.

Kleinfeld's "Six Degrees: Urban Myth?" is an article that explores the origins and validity of the six degrees of separation concept. The article reviews the history of the concept, including Milgram's research, and discusses the limitations and criticisms of the research. The article concludes that while the concept of six degrees of separation may not be precise or universal, it has become a useful metaphor for understanding the interconnections of people and ideas in the modern world.