Cite

Autograph letter, signed, to R. and R. Clark

MLA

Dobson, Austin, 1840-1921. Autograph letter, signed, to R. and R. Clark. Box 1. 1890 October 6. https://collections.library.yale.edu/catalog/16626720.

APA, 6th edition

Dobson, Austin, 1840-1921. (["Box 1"])(1890 October 6)[Autograph letter, signed, to R. and R. Clark]. https://collections.library.yale.edu/catalog/16626720.