TY  - BOOK
AU  - Held,Richard
TI  - Image, object, and illusion: readings from Scientific American
SN  - 0716705044
AV  - QP495 .H35
PY  - 1974///]
CY  - San Francisco
PB  - W. H. Freeman
KW  - Optical illusions
KW  - Illusions
N1  - Bibliography: p. [132]-134
ER  -