SINGH, A., V. GUPTA, and N. S. SODHI. “EXTERNAL MALE GENITALIA OF TWO SPECIES OF GENUS PARAGUS LATREILLE (DIPTERA : SYRPHIDAE)”. UTTAR PRADESH JOURNAL OF ZOOLOGY, vol. 5, no. 2, Feb. 1985, pp. 145-8, https://www.mbimph.com/index.php/UPJOZ/article/view/972.