Campbell, R.A. & Williams, A.D. (1984)
Tylocephalum Linton, 1890 (Cestoda: Lecanicephalidea) from the cownose ray, Rhinoptera bonasus (Mitchill, 1815) with a dicussion of its validity and systematic relationships. Proceedings of the Helminthological Society of Washington, 51, 121–134

Williams, A.D. & Campbell, R.A. (1980)
Echinobothrium bonasum sp. n., a new cestode from the cownose ray, Rhinoptera bonasus (Mitchill 1815), in the western North Atlantic. Journal of Parasitology, 66(6), 1036–1038

Williams, A.D. & Campbell, R.A. (1978)
Duplicibothrium minutum gen. et sp. n. (Cestoda: Tetraphyllidea) from the cownose ray, Rhinoptera bonasus (Mitchill 1815). Journal of Parasitology, 64(5), 835–837

Williams, A.D. & Campbell, R.A. (1977)
A new tetraphyllidean cestode, Glyphobothrium zwerneri gen. et sp. n., from the cownose ray, Rhinoptera bonasus (Mitchill 1815). Journal of Parasitology, 63(5), 775–779