APA

Brown D. H., Hawksworth D. L., Bailey R. H. & British Lichen Society. (1976). Lichenology : progress and problems : proceedings of an international symposium held at the University of Bristol. London ; New York: Published for the Systematics Association and the British Lichen Society by Academic Press.

Chicago

Brown D H, Hawksworth D L, Bailey R H and British Lichen Society. 1976. Lichenology : progress and problems : proceedings of an international symposium held at the University of Bristol. London ; New York: Published for the Systematics Association and the British Lichen Society by Academic Press.

Harvard

Brown D. H., Hawksworth D. L., Bailey R. H. and British Lichen Society. (1976). Lichenology : progress and problems : proceedings of an international symposium held at the University of Bristol. London ; New York: Published for the Systematics Association and the British Lichen Society by Academic Press.

MLA

Brown D H, Hawksworth D L, Bailey R H and British Lichen Society. Lichenology : progress and problems : proceedings of an international symposium held at the University of Bristol. London ; New York: Published for the Systematics Association and the British Lichen Society by Academic Press. 1976.