Udall Brad, Hobbs Benjamin, Galloway Gerry, & Canal American Geophysical Union / Youtube. Natural resources 4, water management.
Cita Chicago (17th ed.)Udall Brad, Hobbs Benjamin, Galloway Gerry, i Canal American Geophysical Union / Youtube. Natural Resources 4, Water Management.
Cita MLA (9th ed.)Udall Brad, et al. Natural Resources 4, Water Management.
Atenció: Aquestes cites poden no estar 100% correctes.