SINGH, Y., and M. M. SAXENA. “SUBSTRATE PREFERENCE AMONG GASTROPOD SPECIES IN A POND IN THE ARID REGION OF RAJASTHAN”. UTTAR PRADESH JOURNAL OF ZOOLOGY, vol. 22, no. 3, Apr. 2002, pp. 277-8, https://www.mbimph.com/index.php/UPJOZ/article/view/360.