Bibliography
- Childress , Ronald B. 1975 . “An Analysis of Environmental Education Program and Project Curricula in Selected Public Elementary and Secondary Schools of the United States.” , Knoxville : The University of Tennessee . Unpublished Ed.D. thesis
- Childress , Ronald B. and Paul , A. Wishart . 1975 . A Directory of Public Elementary and Secondary School Environmental Programs and Projects in the United States , Knoxville : Bureau of Educational Research and Service, The University of Tennessee .
- Childress , Ronald B. and Paul , A. Wishart . 1975 . Public School Environmental Education Program and Project Curricula–A National Perspective , Knoxville : Bureau of Educational Research and Service, The University of Tennessee .