Historia scholastica, etc
MLA
Petrus, Comestor, active 12th century. Historia scholastica, etc. 1229.. https://collections.library.yale.edu/catalog/2030424.
APA, 6th edition
Petrus, Comestor, active 12th century. (1229.)[Historia scholastica, etc]. https://collections.library.yale.edu/catalog/2030424.