Cite

The city of Denver / published by H.L. Thayer, Denver, Colo.

MLA

Thayer, H. L. The City of Denver / Published by H.L. Thayer, Denver, Colo. H.L. Thayer, 189AD. https://collections.library.yale.edu/catalog/15818438.

APA, 6th edition

Thayer, H. L. (189 C.E.). The city of Denver / published by H.L. Thayer, Denver, Colo. [Maps]. H.L. Thayer, https://collections.library.yale.edu/catalog/15818438.