00315nam a2200109Ia 450000500170000000800410001710000240005824500460008230000150012865000280014377300340017120250822170806.0250822s9999||||xx |||||||||||||| ||und|| aHerdoiza, Magdalena 0aLos retos de la investigacioĢn educativa ap. 189-205 aINVESTIGACION EDUCATIVA aEcuador debate No. 16 (1988)