MLA

Guillaume, de Deguileville, active 14th century. Le Pelerinage de vie humaine, etc. [ca. 1400]. https://collections.library.yale.edu/catalog/2013558.

APA, 6th edition

Guillaume, de Deguileville, active 14th century. ([ca. 1400])[Le Pelerinage de vie humaine, etc]. https://collections.library.yale.edu/catalog/2013558.