MLA

Grieben-Verlag, Kraatz, and Leopold. München. Grieben's Guide Books, 0AD. https://collections.library.yale.edu/catalog/15476482.

APA, 6th edition

Grieben-Verlag, K., & L. (0 C.E.). München. [Tourist maps]. Grieben's Guide Books, https://collections.library.yale.edu/catalog/15476482.