references 

1. Wong, H. K.,& Wong, R.T. (2010). The First Days of School (4th ed.,pp 82-95). Mountain View, CA: Harry K. Wong Publications,Inc.
2. Lackney, J. A.  (1996).  Teachers as Placemakers:  Investigating Teachers’ Use of the Physical Environment in Instructional Design.  Madison:  University of Wisconsin, College of Engineering, School Design Research Studio. 
   
3. Glasser, W. (1998). Choice Theory: A New Psychology of Personal Freedom. New York: Harper Collins.