MLA

Pierre, de Peckham, -1293. La lumiere as lais. [between 1250 and 1275]. https://collections.library.yale.edu/catalog/11403270.

APA, 6th edition

Pierre, de Peckham, -1293. ([between 1250 and 1275])[La lumiere as lais]. https://collections.library.yale.edu/catalog/11403270.