Citing this Article
 

Owing to the fact that a Living Reviews article may evolve over time, we recommend to cite the article as follows:

Stefan L. Danilishin and Farid Ya. Khalili,
"Quantum Measurement Theory in Gravitational-Wave Detectors",
Living Rev. Relativity 15,  (2012),  5. URL (cited on <date>):
http://www.livingreviews.org/lrr-2012-5

The date given as <date> then uniquely identifies the version of the article
you are referring to.