Reference citation: J.R. Erichsen Jones. (1949). A Further Ecological Study of Calcareous Streams in the 'Black Mountain' District of South Wales. Journal of Animal Ecology. 18(2), pp. 142-159.
Reference citation: J. R. E. Jones, 1949. A further ecological study of calcareous streams in the "Black Mountain" district of South Wales. J. Anim. Ecol. 18:142-159, from pp. 154-55, 157.
Reference citation: E. Percival and H. Whitehead, 1929. A quantitative study of the fauna of some types of stream-bed. J. Ecol. 17:282-314, from p. 311 & overleaf.