Unesco. UNEP International Environmental Programme, Marcinkowski, T. J., Volk, T. L., & Hungerford, H. R. (1990). An environmental education approach to training of middle level teachers: A prototype programme. Unesco.
Chicago Style (17th ed.) CitationUnesco. UNEP International Environmental Programme, Thomas J. Marcinkowski, Trudi L. Volk, and Harold R. Hungerford. An Environmental Education Approach to Training of Middle Level Teachers: A Prototype Programme. Paris: Unesco, 1990.
MLA (9th ed.) CitationUnesco. UNEP International Environmental Programme, et al. An Environmental Education Approach to Training of Middle Level Teachers: A Prototype Programme. Unesco, 1990.
Warning: These citations may not always be 100% accurate.