Urey, Harold C. "A Review of the Structure of the Moon." Proceedings of the American Philosophical Society 115, no. 2 (1971): 72.
-- "On the Origin of Continents and Mountains." Proceedings of the National Academy of Sciences of the United States of America 39, no. 9 (1953): 936.
-- "Technology: Peace or War." Social Science 21, no. 4 (1946): 278.
Urrea, Luis Alberto. Wandering Time: Western Notebooks. The University of Arizona Press, 2015.