Williams, J. O. (John Oscar), 1885- & Speelman, S. R. (Sanford Reed), 1894-. Mule production.. Washington, D.C.. UNT Digital Library. http://digital.library.unt.edu/ark:/67531/metadc1784/. Accessed September 21, 2014.
Note: Inconsistencies in capitalization and punctuation within the Digital Library may affect this citation. Before using this citation in formal writing, please consult your preferred style manual. More information.