APA (7th ed.) Citation

United States. Department of the Interior. (1920). Report of Commissioner of Patents to Congress for year ended Dec. 31, 1920. GPO.

Chicago Style (17th ed.) Citation

United States. Department of the Interior. Report of Commissioner of Patents to Congress for Year Ended Dec. 31, 1920. [Washington]: GPO, 1920.

MLA (9th ed.) Citation

United States. Department of the Interior. Report of Commissioner of Patents to Congress for Year Ended Dec. 31, 1920. GPO, 1920.

Warning: These citations may not always be 100% accurate.