Bray, R. A., G. N. Foster, A. Waeschenbach, and D. T. J. Littlewood. “The Discovery of Progenetic Allocreadium Neotenicum Peters, 1957 (Digenea: Allocreadiidae) in Water Beetles (Coleoptera: Dytiscidae) in Great Britain”. Zootaxa, vol. 3577, no. 1, Dec. 2012, pp. 58–70, doi:10.11646/zootaxa.3577.1.3.