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Norman., Braddy, Simon J. Clarkson, E. N. K. (Euan Neilson Kerr), 1937- Cotton, Trevor J. Tetlie, O. Erik. Moore, Rachel A. Anderson, Lyall I. Dunlop, Jason A. Tollerton, Victor P. Pollitt, Jessica R. Wunderlich, Jörg. Poinar, George O. Penney, David (2004). Chelicerate palaeobiology and evolution. Royal Society of Edinburgh. OCLC356291732. http://worldcat.org/oclc/356291732
