This service has an associated publication. If you use its data, it may be appropriate to reference 2015A&A...582A..68E (ADS BibTeX entry for the publication) either in addition to or instead of the service reference.
To cite the service as such, we suggest the following BibTeX entry:
@MISC{vo:eiusblubedua,
year=2009,
title={References for the Catalogue of Galactic OH Masers},
author={Engels, D. and Bunzel, F.},
url={http://dc.g-vo.org/ohmaser/q/refs/info},
howpublished={{VO} resource provided by the {GAVO} Data Center}
}