TY - JOUR AU - Karami, Morteza AU - Mohammadzade, Azam AU - Afshari, Masomeh TI - The Effect of Cooperative Learning on Group tendency and Academic Achievement of High School Students in Mashhad JO - Research in Curriculum Planning VL - 9 IS - 33 SP - 93 EP - 105 PY - 2012 DO - ER -