APA (7th ed.) Citation

Drewes, H. (1961). Geology of Unalaska Island and adjacent insular shelf, Aleutian Islands, Alaska. United States Department of the Interior, Geological Survey.

Chicago Style (17th ed.) Citation

Drewes, Harald. Geology of Unalaska Island and Adjacent Insular Shelf, Aleutian Islands, Alaska. [Washington, D.C.]: United States Department of the Interior, Geological Survey, 1961.

MLA (9th ed.) Citation

Drewes, Harald. Geology of Unalaska Island and Adjacent Insular Shelf, Aleutian Islands, Alaska. United States Department of the Interior, Geological Survey, 1961.