Cite

In unum ex quatuor, [circa 1175].

MLA

Chrysopolitanus, Zacharias, d. ca. 1175. In unum ex quatuor, [circa 1175].. https://collections.library.yale.edu/catalog/33300628.

APA, 6th edition

Chrysopolitanus, Zacharias, d. ca. 1175. [In unum ex quatuor, [circa 1175].]. https://collections.library.yale.edu/catalog/33300628.