"Data publishers (e.g. data centers) have a responsibility to work with data providers and science teams to develop the actual content of the citation."
Examples taken from the IPY page [accessed 2010 Sept 16]
Cavalieri, D., C. Parkinson, P. Gloersen, and H. J. Zwally. 1996, updated 2006. Sea ice concentrations from Nimbus-7 SMMR and DMSP SSM/I passive microwave data, March 2002–Sept. 2003. Boulder, Colorado USA: National Snow and Ice Data Center. Data set accessed 2008-05-14 at http://nsidc.org/data/nsidc-0051.html.
König-Langlo, Gert and Hatwig Gernandt. 2006. Compilation of radiosonde data from the Antarctic Georg-Forster station of the German Democratic Republic from 1985 to 1992. Bremerhaven, Germany: Alfred Wegener Institute for Polar and Marine Research Data set accessed 2008-05-22. doi:10.1594/PANGAEA.547983
Ball, A. & Duke, M. (2011). How to Cite Datasets and Link to Publications. DCC How-to Guides. Edinburgh: Digital Curation Centre. Available online: http://www.dcc.ac.uk/resources/how-guides
DataCite, www.datacite.org, is an international collaboration of university libraries and information centers that is supporting making datasets discoverable and citeable. Digital Object Identifiers (DOI) are assigned to data by DOI Registration Agencies. DataCite and CrossRef are two DOI registrants.