The general rules for citing data sources are as such:
MLA (Modern Language Association)
Author Last Name, First Name. Title of data set. (Version). Publisher location: Publisher name, Date of publication. Medium of publication. Date accessed. URL.
APA (American Psychological Association)
Author/Rightsholder. (Year). Title of data set (Version number). [Medium of publication]. Retrieved from URL.
Chicago Style
Author/Creator. Title of Dataset. Publisher Location: Publisher name, Year. URL.