TY  - BOOK
AU  - Pidgeon,Douglas
AU  - Yates,Alfred
TI  - An introduction to educational measurement 
SN  - 071005246X
U1  - 371.26 PID 
PY  - 1974///.
CY  - London : 
PB  - Routledge & Kegan Paul, 
KW  - Educational tests and measurements
ER  -