APA (7th ed.) Citation

Langer, W. H. (2002). Managing and protecting aggregate resources (Version 1.0.). U.S. Dept. of the Interior, U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Langer, William H. Managing and Protecting Aggregate Resources. Version 1.0. Denver, Colo.: U.S. Dept. of the Interior, U.S. Geological Survey, 2002.

MLA (9th ed.) Citation

Langer, William H. Managing and Protecting Aggregate Resources. Version 1.0. U.S. Dept. of the Interior, U.S. Geological Survey, 2002.