Cite

Thesaurus pauperum; Physionomia, in French; De junipero et fructu suo [and three additional tracts].

MLA

John XXI, Pope, -1277. Thesaurus pauperum; Physionomia, in French; De junipero et fructu suo [and three additional tracts].. 13th century.. https://collections.library.yale.edu/catalog/16960318.

APA, 6th edition

John XXI, Pope, -1277. (13th century.)[Thesaurus pauperum; Physionomia, in French; De junipero et fructu suo [and three additional tracts].]. https://collections.library.yale.edu/catalog/16960318.