Biswas, S. K., G. C. Ray, C. K. Mandal, and A. Misra. 2008. “Record and Abundance of Earthworms at Ballavpur Wildlife Sanctuary, Birbhum, West Bengal”. Records of the Zoological Survey of India 108 (3):97-108. https://doi.org/10.26515/rzsi/v108/i3/2008/159049.