Owing to the fact that a Living Reviews in Relativity article may evolve over time, we recommend to cite the article as follows:
Matthew Pitkin and Stuart Reid and Sheila Rowan and James Hough,
"Gravitational Wave Detection by Interferometry (Ground and Space)",
Living Rev. Relativity 14, (2011), 5. URL (accessed <date>):
The date given as <date> then uniquely identifies the version of the article you are referring to.