Cite

Autograph letter, annotated "Echota"

MLA

Kilpatrick, Jack Frederick. Autograph Letter, Annotated "Echota". 1933. https://collections.library.yale.edu/catalog/15492078.

APA, 6th edition

Kilpatrick, J. F. (1933). Autograph letter, annotated "Echota". https://collections.library.yale.edu/catalog/15492078.