JOHAL, M., and A. JOSHI. “HISTOMORPHOLOGY OF FEMALE ORGAN SYSTEM OF A NEMATODE OESOPHAGOSTOMUM COLUMBIANUM”. UTTAR PRADESH JOURNAL OF ZOOLOGY, vol. 14, no. 1, Jan. 1994, pp. 7-12, https://www.mbimph.com/index.php/UPJOZ/article/view/1260.