To cite the service as such, we suggest the following BibTeX entry:
@MISC{vo:eiueewohoesa, year=2007, title={Apache Point observations of lensed quasars}, author={{GAVO} Data Center}, url={http://dc.zah.uni-heidelberg.de/apo/res/apo/q/info}, howpublished={{VO} resource provided by the {GAVO} Data Center} }