P. A.  Johnston and Collom, C. J., ?Contrasting structure and morphogenesis of ligaments in Cryptodonta and early Pteriomorphia (Mollusca; Bivalvia)?, in Malacological Society of London, Biology & Evolution of the Bivalvia, Paper and Poster Abstracts, 1999, pp. 25-26.

P. A.  Johnston, ?Systematics and ontogeny of a new bivalve, Umburra cinefacta, from the Silurian of Australia: implications for pteriomorphian evolution?, Alcheringa, vol. 15, pp. 293-319, 1991.

P. A.  Johnston, ?Systematics and ontogeny of a new bivalve, Umburra cinefacta, from the Silurian of Australia: implications for pteriomorphian evolution?, Alcheringa, vol. 15, pp. 293-319, 1991.