MLA

Iwonski, Carl G. Neu Braunfels, Deutsche Colonie in West Texas. Lith. Anst. v. J.G. Bach, 0AD. https://collections.library.yale.edu/catalog/16600404.

APA, 6th edition

Iwonski, C. G. (0 C.E.). Neu Braunfels, Deutsche Colonie in West Texas. [Lithographs--Hand-colored]. Lith. Anst. v. J.G. Bach, https://collections.library.yale.edu/catalog/16600404.