Guide to invertebrate animals
Webb, J. E.
Wallwork, J. A.(John Anthony),1932-
Elgood, J. H.(John H.)
London Macmillan
1975
Previous ed.: published as 'Animal classification' / by J.E. Webb and J.H. Elgood. Ibadan : Ibadan University Press, 1955
ISBN 0-333-19007-6 Pbk : £2.50
Invertebrates