Dyfyniad APA

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.

Dyfyniad Arddull Chicago

Unesco. 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.

Dyfyniad MLA

Unesco. UNEP International Environmental Programme, et al. An Environmental Education Approach to Training of Middle Level Teachers: A Prototype Programme. Unesco, 1990.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.