MLA

Bryher, 1894-1983. Ellerman, Johann Christoph: sketch. Box 151, folder 5107. 1849. https://collections.library.yale.edu/catalog/17290888.

APA, 6th edition

Bryher, 1894-1983. (["Box 151, folder 5107"])(1849)[Ellerman, Johann Christoph: sketch]. https://collections.library.yale.edu/catalog/17290888.