00649nam a22002417i 4500 20141212085904.0 870924s1987 sp gr 000 0 spa c 0014-4029 (papel) eng GERSTEN, R. DIRECT INSTRUCTION:A RESEARCH-BASED APPROACH TO CURRICULUM DESIGN AND TEACHING Curriculum Educación especial Evaluación educativa Método educativo Documental EXCEPTIONAL CHILDREN Vol. 53, no. 1 (1986), p. 17-31 77 C3g AR 19870924 R.120 AR