APA (7th ed.) Citation

United States. Bureau of Mines. (1921). Quantitative microscopic determination of chalcopyrite, chalcocite, bornite, and pyrite in porphyry ore. [publisher not identified].

Chicago Style (17th ed.) Citation

United States. Bureau of Mines. Quantitative Microscopic Determination of Chalcopyrite, Chalcocite, Bornite, and Pyrite in Porphyry Ore. [Washington]: [publisher not identified], 1921.

MLA (9th ed.) Citation

United States. Bureau of Mines. Quantitative Microscopic Determination of Chalcopyrite, Chalcocite, Bornite, and Pyrite in Porphyry Ore. [publisher not identified], 1921.