How do I indicate that the data in a table I have created come from several sources?
Note: This post relates to content in the eighth edition of the MLA Handbook. For up-to-date guidance, see the ninth edition of the MLA Handbook.
Indicate the sources of your data in a note beneath the table or figure. If that is too cumbersome, give the sources in an endnote placed in the text that introduces the table or figure.
Be careful in how you combine data from different sources: are they measuring the same thing, among the same population, across the same time interval? If not, you will want to note any differences in the data or even present them in several tables instead of in one.
Read more on citing data.