Biswas, S., and S. K. Chatterjee. “Scarabaeidae (India Coleoptera) of Silent Valley, Kerala, India With Descriptions of Three New Species”. Records of the Zoological Survey of India, vol. 84, no. 1-4, Dec. 1986, pp. 79-96, doi:10.26515/rzsi/v84/i1-4/1986/161083.