N. A. Birmani, 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, pp. 64–68, Jun. 2011.