1. University of Illinois Elementary School Program-1964;Atkin;Journal of Research in Science Teaching,1964
2. An Evaluation of the BSCS Approach to High School Biology;Ausubal;American Biology Teacher,March, 1966
3. A Seventh Grade Studies Ecology;Bennett;American Biology Teacher,April, 1963
4. An Ecological Study in the Seventh Grade;Bennett;School Science and Mathematics,April, 1964