MLA

Christopher, of Paris. A Collection of His Alchemical Writings, with Some Additional Related Matter by Others. 0AD. https://collections.library.yale.edu/catalog/10676223.

APA, 6th edition

Christopher, of P. (0 C.E.). A collection of his alchemical writings, with some additional related matter by others [Early works to 1800, Manuscripts, Renaissance Italy 16th century, Medieval and Renaissance Manuscripts in Beinecke Library]. https://collections.library.yale.edu/catalog/10676223.