^Janvier, Philippe; Lund, Richard (1983). "Hardistiella montanensis N. gen. et sp. (Petromyzontida) from the Lower Carboniferous of Montana, with Remarks on the Affinities of the Lampreys". Journal of Vertebrate Paleontology. 2 (4): 407–413. Bibcode:1983JVPal...2..407J. doi:10.1080/02724634.1983.10011943. JSTOR4522913.
^Janvier, Philippe; Lund, Richard; Grogan, Eileen D. (September 15, 2004). "Further consideration of the earliest known lamprey,Hardistiella montanensis Janvier and Lund, 1983, from the Carboniferous of Bear Gulch, Montana, U.S.A". Journal of Vertebrate Paleontology. 24 (3): 742–743. doi:10.1671/0272-4634(2004)024[0742:FCOTEK]2.0.CO;2. S2CID131704031.
^P. Janvier and R. Lund. 1983. Hardistiella montanensis n. gen. et sp. (Petromyzontida) from the Lower Carboniferous of Montana, with remarks on the affinities of the lampreys. Journal of Vertebrate Paleontology2(4):407-413