BN Cat. gén.
Dict. of scientific biogr. / C. Coulston Gillispie éd., 1981
Stratigraphical system of organized fossils with reference to the specimens of the
original geological collection in the British Museum explaining their states of preservation
and their use in identifying the British strata / by William Smith, 1995 [document
électronique : reprod. de l'éd. de 1817]