Thelen, Herbert A. <br/><br/>
Classroom grouping for teachability / 
by Herbert A. Thelen 
 - New York :  John Wiley,  1967 
 - xi, 274 p. ;  24 cm. 
<br/><br/>Includes bibliographical references and index 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ability grouping in education<br/>Teacher-student relationships<br/>Grouping--ability
<br/><br/><label>Dewey Class. No.: </label>371.39