Anderson, Daniel et al. Behavior Modification Techniques For The Teachers of the Developmentally Young. Greeley, Colorado: Rocky Mountain Special Education Instructional Materials Center, 1972.
2.
Egner, A.N.; Burdett, C.S.; and Fox, W.L.Observing and Measuring Classroom Behaviors. Austin, Texas : Austin Writers Group, 1972.
3.
Vasa, S.F. and Hiltbrunner, C.L.Precision Referral Form. Laramie, Wyoming: Center for Research, Service and Publication, College of Education, University of Wyoming, 1973.