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Dunlop, J. A. and Penney, D. and Tetlie, O. E. and Anderson, L. I. (2008) How many species of fossil arachnids are there? Journal of Arachnology, 36 (2). pp. 267-272.
Dunlop, J. A. and Anderson, L. I. (2005) A fossil harvestmen (Arachnida, Opiliones) from the Mississippian of East Kirkton, Scotland. Journal of Arachnology, 33 (2). pp. 482-489. DOI 10.1636/04-79.1