- American Association of School Administrators, Conservation Education in American Schools, American Association of School Administrators, Washington, D. C., 1951, p. 62.
- Association for Supervision and Curriculum Development of the National Education Association, Large Was Our Bounty: Natural Resources and the Schools, National Education Association, Washington, D. C., 1948, p. 7.
- Dasmann, Raymond F., Environmental Conservation, John Wiley and Sons, Inc., New York, 1964, pp. 2–3.
- United States Department of the Interior, Quest for Quality, United States Department of the Interior, Washington, D. C., 1965, p. 8.
Environmental Education
Volume 1, 1969 - Issue 1