This service has an associated publication. If you use its data, it may be appropriate to reference 2013A&A...558A..53K (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:MWSC_clusters, year=2013, title={{MWSC} Star Cluster Search}, author={Kharchenko, N.V. and Piskunov, A.E. and Roeser, S. and Schilbach, E. and Scholz, R.-D.}, url={http://dc.zah.uni-heidelberg.de/mwsc/q/clu/info}, howpublished={{VO} resource provided by the {GAVO} Data Center} }