The future of bituminous coals

Chicago citation style
Curtis, Harry A. The future of bituminous coals. 1922. Retrieved from the Digital Public Library of America, http://catalog.hathitrust.org/Record/100232822. (Accessed December 17, 2018.)
APA citation style
Curtis, Harry A, (1922) The future of bituminous coals. Retrieved from the Digital Public Library of America, http://catalog.hathitrust.org/Record/100232822
MLA citation style
Curtis, Harry A. Retrieved from the Digital Public Library of America <http://catalog.hathitrust.org/Record/100232822>.
Note: These citations are programmatically generated and may be incomplete.