TY  - BOOK
AU  - Marshall, A J
AU  - William, W.D.
TI  - Text book of zoology:  : Invertebrates
U1  - 592 M335T 
PY  - 1972///
CY  - London
PB  - : MecMillan, 
KW  -  Zoology
KW  - | Invertebrates
KW  - | Sipunculida
N1  - Reprinted-1974
ER  -