1Joel Burdin. (1995) " Teacher education", The Seventy - fourth Yearbook of the National Society for the Study of Education, p. 296.Chicago: University of Chicago Press.
2J. Galen Saylor, William M. Alexander & Arthur J. Lowis."Curriculum Planning : for Better Teaching and Learning". ( pp. 375-376) USA: Holt,Rinehart and Winston, Inc.