@article{138262, recid = {138262}, author = {Callahan, Joseph F. and Clark, Leonard H.}, title = {Teaching in the middle and secondary schools : planning for competence /}, publisher = {Macmillan ;}, address = {New York :}, pages = {x, 532 p. :}, year = {1988}, url = {http://library.usi.edu/record/138262}, }