MLA

Wilson, Edmund, 1895-1972. Nabokov, Vladimir. Box 50, folder 1355-1358. 1948-52. https://collections.library.yale.edu/catalog/12032081.

APA, 6th edition

Wilson, Edmund, 1895-1972. (["Box 50, folder 1355-1358"])(1948-52)[Nabokov, Vladimir]. https://collections.library.yale.edu/catalog/12032081.