Prasad, S. N. . A Text book of Invertebrate Zoology / Textual Documents S. N. Prasad. - 15th ed / - Allahabad : Kitab mahal , 1976. - 832p ; 23 cm. ISBN: HB Subjects--Index Terms: Zoology T/G-Zoology Dewey Class. No.: 592 / P 886 T