Follow the advice given in your disciplinary style manual. All tables and figures should be labeled and numbered; these are then listed in preliminary pages (see List of Tables/Figures/etc. for more information). Table captions appear above the table, while figure captions appear below the figure. If the table or figure is reproduced from another publication or uses external data, you need to include "Source: ..." and either full publication information or a parenthentical/footnote reference (be sure to include that work in your document's list of references). If you took the photograph, indicate that with a "Photo by author" statement in the caption. If you obtained permission to reproduce the table/figure, include the note, "Reprinted, by permission, from [citation]."