MLA

Linton, W. J. (William James), 1812-1897. Bamberger, Ludwig. Box 1, folder 8. 1851 March 12. https://collections.library.yale.edu/catalog/17327094.

APA, 6th edition

Linton, W. J. (William James), 1812-1897. (["Box 1, folder 8"])(1851 March 12)[Bamberger, Ludwig]. https://collections.library.yale.edu/catalog/17327094.