Letter from James K. Polk to Dr. Isaac J. Thomas

Chicago citation style
Polk, James Knox. Letter from James K. Polk to Dr. Isaac J. Thomas. Retrieved from the Digital Public Library of America, http://cdm15138.contentdm.oclc.org/cdm/ref/collection/p15138coll18/id/1084. (Accessed January 20, 2019.)
APA citation style
Polk, James Knox, Letter from James K. Polk to Dr. Isaac J. Thomas. Retrieved from the Digital Public Library of America, http://cdm15138.contentdm.oclc.org/cdm/ref/collection/p15138coll18/id/1084
MLA citation style
Polk, James Knox. Retrieved from the Digital Public Library of America <http://cdm15138.contentdm.oclc.org/cdm/ref/collection/p15138coll18/id/1084>.
Note: These citations are programmatically generated and may be incomplete.