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. 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.
4. Revision of Plumulites ruskini Lamont, and new data from the Silurian of the Pentland Hills, Scotland
5. Haswell, G. C. 1865. On the Silurian Formation in Pentland Hills. William P. Nimmo, Edinburgh.