Unesco-UNEP International Environmental Education Programme, Meaders, O. D., Bobbitt, F., & Johnson, D. I. (1988). Environmental education in vocational agriculture curriculum and agriculture teacher education in Michigan, U.S.A.: A case study. Unesco.
Παραπομπή σε μορφή Chicago (17η εκδ.)Unesco-UNEP International Environmental Education Programme, O. Donald Meaders, Frank Bobbitt, και David I. Johnson. Environmental Education in Vocational Agriculture Curriculum and Agriculture Teacher Education in Michigan, U.S.A.: A Case Study. Paris: Unesco, 1988.
Παραπομπή σε μορφή MLA (9th εκδ.)Unesco-UNEP International Environmental Education Programme, et al. Environmental Education in Vocational Agriculture Curriculum and Agriculture Teacher Education in Michigan, U.S.A.: A Case Study. Unesco, 1988.