MLA

Clark, William, 1770-1838. Draft of the Columbia River, perhaps the area of the route about October 30-November 1, 1805. Box 2, folder 54v. circa 1803-1810. https://collections.library.yale.edu/catalog/2002506.

APA, 6th edition

Clark, William, 1770-1838. (["Box 2, folder 54v"])(circa 1803-1810)[Draft of the Columbia River, perhaps the area of the route about October 30-November 1, 1805]. https://collections.library.yale.edu/catalog/2002506.