TY  - BOOK
AU  - Keller,Fred Simmons
AU  - Sherman,J.Gilmour
TI  - PSI , the keller plan handbook : : essays on a personalized system of instruction  / 
SN  - 0805352368 (pbk.)
U1  - 371.394 
PY  - 1974///
CY  - Menlo Park , Calif  : 
PB  - W.A Benjamin Inc. , 
KW  - Instructional systems
KW  - Individualized instruction
N1  -  Includes index
ER  -