MLA

Brehm, George, 1878-1966, Eastman, Max, 1883-1969. Freud thinks that such "accidents" as falling downstairs are often really intentional. 1915 July. https://collections.library.yale.edu/catalog/2110200.

APA, 6th edition

Brehm, George, 1878-1966, & Eastman, Max, 1883-1969. (1915 July)[Freud thinks that such "accidents" as falling downstairs are often really intentional]. https://collections.library.yale.edu/catalog/2110200.