MLA

Stone, Sidney Mason, 1803-1882. Sidney Mason Stone architectural drawings. Folder 1-6. [ca. 1840-1850?]. https://collections.library.yale.edu/catalog/11679491.

APA, 6th edition

Stone, Sidney Mason, 1803-1882. (["Folder 1-6"])([ca. 1840-1850?])[Sidney Mason Stone architectural drawings]. https://collections.library.yale.edu/catalog/11679491.