MLA

Gaines, Edmund Pendleton, 1777-1849. Letter : New Orleans, to David Francis Bacon. Box 52, folder GROUP 1840, F-1. 1849 Feb 26. https://collections.library.yale.edu/catalog/17455498.

APA, 6th edition

Gaines, Edmund Pendleton, 1777-1849. (["Box 52, folder GROUP 1840, F-1"])(1849 Feb 26)[Letter : New Orleans, to David Francis Bacon]. https://collections.library.yale.edu/catalog/17455498.