Hyman L., . (1959). Invertebrates:Small Coelomate groups vol V. : Mcgraw hill.
Hyman L.H, . 1959. Invertebrates:Small Coelomate groups vol V. : Mcgraw hill.
Hyman L.H, . Invertebrates:Small Coelomate groups vol V. : Mcgraw hill. 1959.