MLA

Hull, Clark Leonard, 1884-1952. Aptitude tests, principles and methods of determining vocational and other specific attitudes. Box 1, folder 1 | reel 1U. 1925. https://collections.library.yale.edu/catalog/33503544.

APA, 6th edition

Hull, Clark Leonard, 1884-1952. (["Box 1, folder 1 | reel 1U"])(1925)[Aptitude tests, principles and methods of determining vocational and other specific attitudes]. https://collections.library.yale.edu/catalog/33503544.