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:engels_oh_mon, year=2009, title={A Database of Circumstellar OH Masers: Monitoring Programs}, author={Engels, D. and Bunzel, F.}, url={http://dc.zah.uni-heidelberg.de/ohmaser/q/monscs/info}, howpublished={{VO} resource provided by the {GAVO} Data Center} }