MLA

Sleem, D. H. (David H.). Map of Willow Creek Mining District, Cook Inlet Precinct, Alaska / compiled ... by D.H. Sleem.. BRBL_00634. c1910.. https://collections.library.yale.edu/catalog/15821775.

APA, 6th edition

Sleem, D. H. (David H.). (["BRBL_00634"])(c1910.)[Map of Willow Creek Mining District, Cook Inlet Precinct, Alaska / compiled ... by D.H. Sleem.]. https://collections.library.yale.edu/catalog/15821775.