Autograph letter, signed, (draft) to Joseph Ellis Trevor. New Haven.
MLA
Gibbs, J. Willard (Josiah Willard), 1839-1903. Autograph letter, signed, (draft) to Joseph Ellis Trevor. New Haven.. Box 1, folder 24. 1899 March 6. https://collections.library.yale.edu/catalog/16662396.
APA, 6th edition
Gibbs, J. Willard (Josiah Willard), 1839-1903. (["Box 1, folder 24"])(1899 March 6)[Autograph letter, signed, (draft) to Joseph Ellis Trevor. New Haven.]. https://collections.library.yale.edu/catalog/16662396.