Keller, Fred Simmons ,    1899- <br/><br/>
PSI , the keller plan handbook :   essays on a personalized system of instruction  /  
Fred S.Keller, J. Gilmour Sherman ; with a contrib ution by Carolina Martuscell  Bori. 
 - Menlo Park , Calif  :   W.A Benjamin Inc. ,   1974. 
 - xii, 99 p. ;    24 cm. 
 - The Benjamin PSI series.   .
<br/><br/>  Includes index. 
<br/><br/><label>ISBN: </label>0805352368 (pbk.) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Instructional systems.--------<br/>Individualized instruction.--------
<br/><br/><label>Dewey Class. No.: </label>371.394