Παραπομπή σε μορφή APA (7η εκδ.)

Unesco-UNEP International Environmental Education Programme & Hungerford, H. R. (1988). An environmental education appoach to the training of elementary teachers: A teacher education programme. Unesco.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Unesco-UNEP International Environmental Education Programme και Harold R. Hungerford. An Environmental Education Appoach to the Training of Elementary Teachers: A Teacher Education Programme. Paris: Unesco, 1988.

Παραπομπή σε μορφή MLA (9th εκδ.)

Unesco-UNEP International Environmental Education Programme και Harold R. Hungerford. An Environmental Education Appoach to the Training of Elementary Teachers: A Teacher Education Programme. Unesco, 1988.