MLA

Colby (Family), Colby, Clara Dorothy Bewick, 1846-1916, Colby, L. W. (Leonard Wright), 1846-1924. Colby family letters concerning life in Nebraska. 1865-1877. https://collections.library.yale.edu/catalog/17264990.

APA, 6th edition

Colby (Family), & Colby, Clara Dorothy Bewick, 1846-1916, & Colby, L. W. (Leonard Wright), 1846-1924. (1865-1877)[Colby family letters concerning life in Nebraska]. https://collections.library.yale.edu/catalog/17264990.