Copper, P. (1991). Evolution of the atrypid brachiopods. Pp. 35-40 in MacKinnon, D.I., Lee, D.E. & Campbell, J.D. (eds): Brachiopods through Time. Proceedings of the 2nd International Brachiopod Congress, University of Otago, Dunedin, New Zealand, 5-9 February 1990. CRC Press.
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Copper, P.
1991
Evolution of the atrypid brachiopods. Pp. 35-40 in MacKinnon, D.I., Lee, D.E. & Campbell, J.D. (eds): Brachiopods through Time. Proceedings of the 2nd International Brachiopod Congress, University of Otago, Dunedin, New Zealand, 5-9 February 1990. CRC Press.