Chiras, D. D. (1998). Environmental science: A systems approach to sustainable development (5th ed.). Wadsworth Publishing Company.
Cita Chicago (17th ed.)Chiras, Daniel D. Environmental Science: A Systems Approach to Sustainable Development. 5th ed. Belmont: Wadsworth Publishing Company, 1998.
Cita MLA (9th ed.)Chiras, Daniel D. Environmental Science: A Systems Approach to Sustainable Development. 5th ed. Wadsworth Publishing Company, 1998.
Atenció: Aquestes cites poden no estar 100% correctes.