TY  - BOOK
AU  - Longford, Nicholas T.
TI  - Models for uncertainity in educational testing
T2  - Springer series in statistics
SN  - 0-387-94513-X
U1  - 519.243 
PY  - 1995///
CY  - New York
PB  - Springer-Verlag
KW  - Educational tests and methods
ER  -