APA (7th ed.) Citation

Geological Survey (U.S.) & Tooker, E. W. (1990). Gold in porphyry copper systems. Dept. of the Interior, U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Geological Survey (U.S.) and Edwin W. Tooker. Gold in Porphyry Copper Systems. [Reston, Va.]: Dept. of the Interior, U.S. Geological Survey, 1990.

MLA (9th ed.) Citation

Geological Survey (U.S.) and Edwin W. Tooker. Gold in Porphyry Copper Systems. Dept. of the Interior, U.S. Geological Survey, 1990.