Sutton, M. D., Briggs, D. E. G., Siveter, D. J., Siveter, D. J., & Orr, P. J. (2002). The arthropod Offacolus kingi (Chelicerata) from the Silurian of Herefordshire, England: Computer based morphological reconstructions and phylogenetic affinities.

Sutton, Mark D., Derek E G. Briggs, David J. Siveter, Derek J. Siveter, and Patrick J. Orr. The Arthropod Offacolus Kingi (Chelicerata) From the Silurian of Herefordshire, England: Computer Based Morphological Reconstructions and Phylogenetic Affinities. 2002.

Sutton, Mark D., et al. The Arthropod Offacolus Kingi (Chelicerata) From the Silurian of Herefordshire, England: Computer Based Morphological Reconstructions and Phylogenetic Affinities. 2002.