TY  - BOOK
AU  - Guilford, J. P
TI  - Psychometric methods / 
U1  - 150.545 GUI-P 334 1936 
PY  - 1954///
CY  - New York: 
PB  - McGraw-Hill Book Company , 
KW  - Psychology
N1  - Psychophysical theory

; Method of minimal changes; A Mathematical introduction
ER  -