Cite

Fort Ringgold, Tex. House in which Gen. Robert E. Lee (then 1st Lt) resigned his commission (1861) from U.S. Army to join Confederate Army

MLA

Fort Ringgold, Tex. House in Which Gen. Robert E. Lee (Then 1st Lt) Resigned His Commission (1861) from U.S. Army to Join Confederate Army. 0AD. https://collections.library.yale.edu/catalog/2017377.

APA, 6th edition

Fort Ringgold, Tex. House in which Gen. Robert E. Lee (then 1st Lt) resigned his commission (1861) from U.S. Army to join Confederate Army. (0 C.E.). [Photographic postcards, Photographic prints, Photographs]. https://collections.library.yale.edu/catalog/2017377.