SINGH, A., N. S. SODHT, and V. GUPTA. “EXTERNAL MALE GENITALIA OF FOUR SPECIES OF GÈNUS ERISTALIS LATREILLE (SYRPHIDAE : DIPTERA)”. UTTAR PRADESH JOURNAL OF ZOOLOGY, vol. 6, no. 1, Jan. 1986, pp. 29-35, https://www.mbimph.com/index.php/UPJOZ/article/view/986.