Marshall, A.J. . Text-Book of Zoology: Invertebrates / Textual Documents A.J. Marshall and W.D. Williams. - 7th ed. / - London : Macmillan Press Ltd. , 1972. - xix,874p. : ill ; 24cm . Index Subjects--Index Terms: Zoology Invertebrates G-Zoology Dewey Class. No.: 592 / M 335 T