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# Linking Data  Traditionally, the only citations within scholarly writing are to other scholarly writing. In some Journals today, URLs are allowed as footnotes, but not typically as full-fledged references within citations. This is for good reason. URLs are notoriously ephemeral, and URLs pointing to data have half-lives of less than a decade \cite{doi:10.1371/journal.pone.0104798}. \cite{Pepe_2014}.  A great deal of public scholarly worrying (and writing) about how to offer robust, long-lived, links to data has gone on over especially the past decade (\citet[][and references therein]{Goodman_2014}). Here, we will just offer the following practical advice. **If a dataset can be assigned a long-term identifier that moves with data as it moves from one computer system to another, then such an identifier should be sought, and it should be cited in scholarly articles**. One modern version of such "persistent" identifiers are "DOIs" which use the so-called ["Handle"](http://www.handle.net) system. Details on how this system works are here: http://www.doi.org/factsheets/DOIHandle.html.