Clarkson, E. N. K. (1979). Invertebrate palaeontology and evolution. G. Allen & Unwin.
Cita Chicago (17th ed.)Clarkson, E. N. K. Invertebrate Palaeontology and Evolution. London ; Boston: G. Allen & Unwin, 1979.
Cita MLA (8th ed.)Clarkson, E. N. K. Invertebrate Palaeontology and Evolution. G. Allen & Unwin, 1979.
Atenció: Aquestes cites poden no estar 100% correctes.