Cita APA

Spahr, N. E., & Spahr, N. E. (2000). Water quality in the Upper Colorado River Basin, Colorado, 1996-96. Denver, Colo.: Departamento of the Interior, U.S. Geological Survey.

Citación estilo Chicago

Spahr, Norman E., y Norman E. Spahr. Water Quality in the Upper Colorado River Basin, Colorado, 1996-96. Denver, Colo.: Departamento of the Interior, U.S. Geological Survey, 2000.

Cita MLA

Spahr, Norman E., y Norman E. Spahr. Water Quality in the Upper Colorado River Basin, Colorado, 1996-96. Denver, Colo.: Departamento of the Interior, U.S. Geological Survey, 2000.