Owing to the fact that a Living Reviews in Relativity article may evolve over time, we recommend to cite the article as follows:
Robert M. Wald,
"The Thermodynamics of Black Holes",
Living Rev. Relativity 4, (2001), 6. URL (accessed <date>):
http://www.livingreviews.org/lrr-2001-6
The date given as <date> then uniquely identifies the version of the article you are referring to.