Citing this Article
 

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

Matthew Pitkin and Stuart Reid and Sheila Rowan and Jim Hough ,
"Gravitational Wave Detection by Interferometry
(Ground and Space)",
Living Rev. Relativity 14,  (2011),  5. URL (cited on <date>):
http://www.livingreviews.org/lrr-2011-5

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