Dortignac, E. (1956). Watershed resources and problems of the upper Rio Grande Basin. United States Department of Agriculture.
Citazione stile Chigago Style (17a edizione)Dortignac, E.J. Watershed Resources and Problems of the Upper Rio Grande Basin. U.S.: United States Department of Agriculture, 1956.
Citatione MLA (9a ed.)Dortignac, E.J. Watershed Resources and Problems of the Upper Rio Grande Basin. United States Department of Agriculture, 1956.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.