TY  - BOOK
AU  - Wright , W . D
TI  - The Perception Of Light
U1  - PL99 
CY  - London
PB  - Blackie And Son 
KW  - Physics Light, Heat and Sound
N1  - PL means Physics Light, Heat and Sound Page No. 465-469 in A-Z Accession Register (Accession No. PL1-PL131)
ER  -