Lund Richard. Harpagofututor volsellorhinus new genus and species (Chondrichthyes, Chondrenchelyiformes) from the Namurian Bear Gulch Limestone, Chondrenchelys problematica Traquair (Visean), and their sexual dimorphism // J. Paleontology. — 1982. — Vol. 56, issue 4. Р. 938–958 [1] [Архівовано 26 березня 2016 у Wayback Machine.]
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Lund Richard. Harpagofututor volsellorhinus new genus and species (Chondrichthyes, Chondrenchelyiformes) from the Namurian Bear Gulch Limestone, Chondrenchelys problematica Traquair (Visean), and their sexual dimorphism // J. Paleontology. — 1982. — Vol. 56, issue 4. Р. 938–958 [1] [Архівовано 26 березня 2016 у Wayback Machine.]
