MLA

Book, Beinecke Rare, and Manuscript Library. Chasles, Philarète. 0AD. https://collections.library.yale.edu/catalog/17353466.

APA, 6th edition

Book, B. R., & Library, M. (0 C.E.). Chasles, Philarète. https://collections.library.yale.edu/catalog/17353466.