MLA

E.P. Dutton (Firm), publisher, Milne, A. A. (Alan Alexander), 1882-1956, Shepard, Ernest H. (Ernest Howard), 1879-1976, ill. Winnie-the-Pooh / by A.A. Milne ; with decorations by Ernest H. Shepard. ca. 1926. https://collections.library.yale.edu/catalog/10690934.

APA, 6th edition

E.P. Dutton (Firm), publisher, & Milne, A. A. (Alan Alexander), 1882-1956, & Shepard, Ernest H. (Ernest Howard), 1879-1976, ill. (ca. 1926)[Winnie-the-Pooh / by A.A. Milne ; with decorations by Ernest H. Shepard]. https://collections.library.yale.edu/catalog/10690934.