TY  - BOOK
AU  - Piotrowski,Zygmunt A
TI  - Perceptanalysis: A fundamentally reworked expanded and sytematized 
U1  - 150 
PY  - 1957///
CY  - Newyork
PB  - The macmillan company
N1  - Include bibliographical references and index
ER  -