MLA

Geological Survey (U.S.). Topographic map of Iniskin-Chinitna Peninsula, Cook Inlet region, Alaska / United States Department of the Interior Geological Survey ; Alfred H. Brooks, geologist in charge of division ; topography by C.P. McKinley and Gerald Fitz-Gerald.. BRBL_00633. 1922. https://collections.library.yale.edu/catalog/15821748.

APA, 6th edition

Geological Survey (U.S.). (["BRBL_00633"])(1922)[Topographic map of Iniskin-Chinitna Peninsula, Cook Inlet region, Alaska / United States Department of the Interior Geological Survey ; Alfred H. Brooks, geologist in charge of division ; topography by C.P. McKinley and Gerald Fitz-Gerald.]. https://collections.library.yale.edu/catalog/15821748.