Maplestone, P. A. (1931) “Parasitic Nematodes Obtained from Animals Dying in the Calcutta Zoological Gardens. Part VIII. Oesophagostominae and Necatorinae”, Records of the Zoological Survey of India, 33(2), pp. 145–171. doi: 10.26515/rzsi/v33/i2/1931/162499.