MLA

Sala, George Augustus, 1828-1895. Webster, Benjamin. Box 8. 1841 May. https://collections.library.yale.edu/catalog/17478344.

APA, 6th edition

Sala, George Augustus, 1828-1895. (["Box 8"])(1841 May)[Webster, Benjamin]. https://collections.library.yale.edu/catalog/17478344.