Trevor, Joseph Ellis (1864-1941) - 5 autograph letters, signed, and 2 typed letters, signed, to Josiah Willard Gibbs. Ithaca.
MLA
Gibbs, J. Willard (Josiah Willard), 1839-1903. Trevor, Joseph Ellis (1864-1941) - 5 autograph letters, signed, and 2 typed letters, signed, to Josiah Willard Gibbs. Ithaca.. Box 3, folder 117. 1895-1899. https://collections.library.yale.edu/catalog/16662399.
APA, 6th edition
Gibbs, J. Willard (Josiah Willard), 1839-1903. (["Box 3, folder 117"])(1895-1899)[Trevor, Joseph Ellis (1864-1941) - 5 autograph letters, signed, and 2 typed letters, signed, to Josiah Willard Gibbs. Ithaca.]. https://collections.library.yale.edu/catalog/16662399.