A procedure for evaluating environmental impact

MLA

Geological Survey (U.S.) and Luna B. Leopold. A procedure for evaluating environmental impact. Washington : U.S. Dept. of the Interior, 1971.

APA

Geological Survey (U.S.) & Leopold, L. (1971). A procedure for evaluating environmental impact. Washington : U.S. Dept. of the Interior.

Chicago

Geological Survey (U.S.) and Luna B. Leopold. A procedure for evaluating environmental impact. Washington : U.S. Dept. of the Interior, 1971.