Captions appear below the image in paper's, and presentations, and typically begin with the abbreviation Fig. (for Figure) followed by a number and then a brief description.

If a description is included that provides a complete citation then there does not need to be an entry in the works cited or bibliography.

Fig. 1. Hine, Lewis W. Boy Employed by the
Turkey Knob Mine, MacDonald, W.Va. 1908.
Prints and Photographs Division, Library of
Congress.Web.18 Feb. 2015.