TY  - BOOK
AU  - Marshall,A.J.
AU  - Williams,W.D.
TI  - Textbook of Zoology: invertebrates 
SN  - 8174730311
U1  - 592 
PY  - 1995///
CY  - New Delhi
PB  - A.I.T.B.S Publishers
KW  - Zoology
N1  - Includes index.
ER  -