Smith, R. M. (1969). Teacher dignosis of educational difficulties. Charles E.Merrill.
Chicago-viite (17. p.)Smith, Robert M. Teacher Dignosis of Educational Difficulties. Columbus: Charles E.Merrill, 1969.
MLA-viite (9. p.)Smith, Robert M. Teacher Dignosis of Educational Difficulties. Charles E.Merrill, 1969.
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