| Wills, M.A., 1993. ?Mollusca incertae sedis. In M.J. Benton (ed.), The Fossil Record 2. Chapman & Hall, London: [265]-270. 
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		| Wills, M.A., 1993. Annelida. In M.J. Benton (ed.), The Fossil Record 2. Chapman & Hall, London: [271]-278. 
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		| Wills, M.A., 1993. Miscellania. In M.J. Benton (ed.), The Fossil Record 2. Chapman & Hall, London: [555]-560. 
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		| Wills, M.A. & Sepkoski, J.J., Jr., 1993. Problematica. In M.J. Benton (ed.), The Fossil Record 2. Chapman & Hall, London: [543]-554. 
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