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.