MLA

Carlingford, Theobald Taaffe, Earl of, -1677. ALS, Bruges. Box 1, folder 8. [1657] March 21 [n.s.]. https://collections.library.yale.edu/catalog/15297711.

APA, 6th edition

Carlingford, Theobald Taaffe, Earl of, -1677. (["Box 1, folder 8"])([1657] March 21 [n.s.])[ALS, Bruges]. https://collections.library.yale.edu/catalog/15297711.