TY  - BOOK
AU  - Powell, William.
TI  - Teacher self-supervision: why teacher evaluation has failed and what can we do about it 
SN  - 9781909717671
AV  - LB 2838 .P882 2015
PY  - 2015///
CY  - UK, 
PB  - John Catt Educational Ltd
N1  - Includes bibliographical references
ER  -