MLA

Altzenbach, Wilhelm. Die Statt Aachen. 0AD. https://collections.library.yale.edu/catalog/16546516.

APA, 6th edition

Altzenbach, W. (0 C.E.). Die Statt Aachen. [Bird's-eye view prints., Bird's-eye views--Germany--Aachen--1700., Engravings, Intaglio prints]. https://collections.library.yale.edu/catalog/16546516.