APA (7th ed.) Citation

United States. Government Accountability Office. (2021). Hardrock mining systems. U.S. Government Accountability Office.

Chicago Style (17th ed.) Citation

United States. Government Accountability Office. Hardrock Mining Systems. [Washington, D.C.]: U.S. Government Accountability Office, 2021.

MLA (9th ed.) Citation

United States. Government Accountability Office. Hardrock Mining Systems. U.S. Government Accountability Office, 2021.