1. Machaeridian classification
2. A new species of machaeridian from the Silurian of Podolia, USSR, with a review of the Turrilepadidae;Adrain;Palaeontology,1991
3. Silurian trilobites from southwestern Alaska
4. Barrande J. 1872. Systême Silurien du Centre de la Bohème. 1ère Partie: Recherches Paléontologiques. Supplément au Volume 1. Trilobites, Crustacés Divers et Poissons. Carl Wilhelm Medau, Prague et Paris, i–xxx.1—647, pls 1—35.
5. Clarkson E.N.K. Taylor C.M. 2007. Silurian rocks and fossils in the Pentland Hills. In: Clarkson E.N.K. Harper D.A.T. Taylor C.M. Anderson L.I. (eds) Silurian Fossils of the Pentland Hills, Scotland. The Palaeontological Association, London, 8–29.