The general rule for citing data is to stick with the style for citing a journal article. Definitely include the creator, title, year of publication, publisher (usually the archive in which it is found), edition or version, and access information (e.g. a URL).
The idea is to give credit to the author or producer of the data, and give information to allow others to find the data you found.
Citing a map from Social Explorer? The database offers advice and examples on how to cite their maps.