1. Louis Agassiz, Recherches sur les poissons fossiles. Neuchâtel, 1833–43.
2. Richard Owen, Odontography. London, 1840–1845.
3. On the Intimate Structure of Bone, as composing the Skeleton in the four great Classes of Animals, viz., Mammals, Birds, Reptiles, and Fishes, with some Remarks on the great Value of the Knowledge of such structure in determining the Affinities of Minute Fragments of Organic Remains. By John Quekett, Assistant Conservator of the Museum of the Royal College of Surgeons of England. The Transactions of the Microscopical Society of London. Vol. II. London 1849.
4. C. Hasse, Die fossilen Wirbel. Morphologisches Jahrbuch. Bd. II. 1876.