Ex Libris, E. MacDowel Cosgrave, M.D., &c.
MLA
Ex Libris, E. MacDowel Cosgrave, M.D., &c. 1898. https://collections.library.yale.edu/catalog/16789319.
APA, 6th edition
Ex Libris, E. MacDowel Cosgrave, M.D., &c. (1898). [Bookplates]. https://collections.library.yale.edu/catalog/16789319.