C. William Horrell, Henry Dan Piper, and John W. Voigt

Chicago citation style
Unknown. C. William Horrell, Henry Dan Piper, and John W. Voigt. undated. Retrieved from the Digital Public Library of America, http://collections.carli.illinois.edu/cdm/ref/collection/sic_photos/id/2341. (Accessed December 12, 2018.)
APA citation style
Unknown, (undated) C. William Horrell, Henry Dan Piper, and John W. Voigt. Retrieved from the Digital Public Library of America, http://collections.carli.illinois.edu/cdm/ref/collection/sic_photos/id/2341
MLA citation style
Unknown. Retrieved from the Digital Public Library of America <http://collections.carli.illinois.edu/cdm/ref/collection/sic_photos/id/2341>.
Note: These citations are programmatically generated and may be incomplete.