- Association of Interpretive Naturalists, “Preparation of the Interpretive Naturalist,” position statement, 1969.
- Ernst, Stanton G., “Trends in the Use of Interpretive Naturalists—Their Qualifications and Procurement,” unpublished manuscript for speech delivered to the Congress for Recreation and Parks, Miami Beach, Florida, 1967.
- Goode, William J.; Hatt, Paul K., Methods in Social Research, McGraw-Hill, New York, 1952.
- Gullahorn, Jeanne E.; Gullahorn, JohnT., “An Investigation of the Effects of Three Factors on Response to Mail Questionnaires,” Public Opinion Quarterly, 27:294–296.
- Mahaffey, Ben D.; Berger, Michael E., A Glossary of Selected Terms for Interpreters, The Association of Interpretive Naturalists and The Department of Recreation and Parks, Texas A and M University, College Station, Texas, 1972.
- Mahaffey, Ben D., “Classrooms Unlimited,” Parks and Recreation, 3(no. 7): 36–37.
- Mahaffey, Ben D., Environmental Interpretation, Department of Recreation and Parks, Texas A and M University, College Station, Texas, 1971.
- Mahaffey, Ben D., “Nature Interpretation and the Machine Age,” Nature Study, 23(no. 2): 1–2.
- Meyer, Paul L., Introductory Probability and Statistical Applications, Addison-Wesley, Reading, Massachusetts, 1970.
- Replinger, Jean Sanford, “Institutions Which Indicate They Have a Curriculum that Provides for the Education of an Interpretive Naturalist or Environmental Interpreter,” unpublished paper from the Association of Interpretive Naturalists' Training and Certification Committee, 1968.
- Society of Park and Recreation Educators, College and University Curricula in Recreation and Park Education, National Recreation and Park Association, Washington, D.C., 1970.
- Summers, Gene F., Attitude Measurement, Rand McNally, Chicago, 1970.
The Journal of Environmental Education
Volume 5, 1973 - Issue 1: The Media and the Message