United Nations Environment Programme, United Nations Environment Programme. Environmental Education and Training Unit, Atchia, M., & Tropp, S. (1995). Environmental management: Issues and solutions. Wiley.
Cita Chicago (17th ed.)United Nations Environment Programme, United Nations Environment Programme. Environmental Education and Training Unit, Michael Atchia, i Shawna Tropp. Environmental Management: Issues and Solutions. Chichester: Wiley, 1995.
Cita MLA (9th ed.)United Nations Environment Programme, et al. Environmental Management: Issues and Solutions. Wiley, 1995.
Atenció: Aquestes cites poden no estar 100% correctes.