The cambridge natural history, v4- crustacea by Smith, Cr & Weldon, wfr: trilobites and euryterida by woods, H:introduction to arachnida, king crabs, tradigrada ( water-bears) and pentastohida by Shilpey, A E:corpions, spiders, mites, ticks etc by Warburton, C:pycnogonida by Thomson, D A W
- New Delhi Today & Tomorrow 1981
- xviii, 566 p.