Smith, A. B. (1995). Echinoids from the Jurassic Oxford Clay of England. Zenodo.
Cita Chicago (17th ed.)Smith, Andrew B. Echinoids from the Jurassic Oxford Clay of England. Zenodo, 1995.
Cita MLA (9th ed.)Smith, Andrew B. Echinoids from the Jurassic Oxford Clay of England. Zenodo, 1995.
Atenció: Aquestes cites poden no estar 100% correctes.