Hyman L., . (1967). Invertebrates:Small Coelomate groups vol V. : Mcgraw hill.
Hyman L.H, . 1967. Invertebrates:Small Coelomate groups vol V. : Mcgraw hill.
Hyman L.H, . Invertebrates:Small Coelomate groups vol V. : Mcgraw hill. 1967.