MLA

after nature by Erhard Pentenrieder, Drawn. Main Plaza San Antonio, Texas. Pentenrieder & Blersch, 0AD. https://collections.library.yale.edu/catalog/2016011.

APA, 6th edition

after nature by Erhard Pentenrieder, D. (0 C.E.). Main Plaza San Antonio, Texas [Lithographs, Planographic prints]. Pentenrieder & Blersch. https://collections.library.yale.edu/catalog/2016011.