Historia scholastica, [1190s].
MLA
Petrus, Comestor, active 12th century. Historia scholastica, [1190s].. https://collections.library.yale.edu/catalog/2007328.
APA, 6th edition
Petrus, Comestor, active 12th century. [Historia scholastica, [1190s].]. https://collections.library.yale.edu/catalog/2007328.