This service has an associated publication. If you use its data, it may be appropriate to reference 2003AJ....125..984M (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:usnob_plates, year=2009, title={{USNO}-B1 plates}, author={{GAVO} Data Centre}, url={https://dc.zah.uni-heidelberg.de/usnob/res/plates/pq/info}, howpublished={{VO} resource provided by the {GAVO} Data Center} }