Birmani, N. A., A. M. Dharejo, and M. M. Khan. “A New Species of Polymorphus Lühe, 1911 (Acanthocephala: Polymorphidae) in Black Coot, Fulica Atra (Aves: Rallidae), Pakistan”. Zootaxa, vol. 2929, no. 1, June 2011, pp. 64–68, doi:10.11646/zootaxa.2929.1.7.