MLA

Cordus, Euricius, 1484-1535, Cordus, Valerius, 1515-1544, Dioscorides Pedanius, of Anazarbos, Egenolff, Christian, 1502-1555, printer, Gessner, Conrad, 1516-1565, Ruel, Jean, 1474-1537, Ryff, Walther Hermann, d. 1548. [De materia medica]. [Anno 1549. Mense Aprili]. https://collections.library.yale.edu/catalog/2109158.

APA, 6th edition

Cordus, Euricius, 1484-1535, & Cordus, Valerius, 1515-1544, & Dioscorides Pedanius, of Anazarbos, & Egenolff, Christian, 1502-1555, printer, & Gessner, Conrad, 1516-1565, & Ruel, Jean, 1474-1537, & Ryff, Walther Hermann, d. 1548. ([Anno 1549. Mense Aprili])[[De materia medica]]. https://collections.library.yale.edu/catalog/2109158.