00357nam a2200121Ia 4500082001700000100002000017245006100037260003800098300001000136650003600146650002600182650002700208  a150.71 PET-;  aPetrovsky, A.V. 0aStudies in psychology: the collective and the individual  aMoscowbProgress Publishersc1985  a253p.  aPsychology - Study and teaching  aPsychology - Research  aEducational psychology