Citing your data source is just as important as citing traditional research sources. Standards have not been agreed upon in citing datasets. Datasets acquired by the Library of Congress often contain recommended citation formats. Following are some guides developed by other institutions that contain citation assistance.
Quick Guide to Data Citation, IASSIST External
The IASSIST organization of data professionals recommends consulting the Quick Guide to Data Citation for suggestions on the best way to cite data in APA, MLA, and Chicago styles.