Owing to the fact that a Living Reviews in Relativity article may evolve over time, we recommend to cite the article as follows:
Carlos Barceló and Stefano Liberati and Matt Visser,
"Analogue Gravity",
Living Rev. Relativity 8, (2005), 12. URL (accessed <date>):
http://www.livingreviews.org/lrr-2005-12
The date given as <date> then uniquely identifies the version of the article you are referring to.