Jacquemyn, H., Endels, P., Brys, R., Hermy, M. & Woodell, S.R.J. (2009) Biological Flora of the British Isles: Primula vulgaris Huds. (P. acaulis (L.) Hill). Journal of Ecology, 97, 812–833.
Taylor, K. (2005) Biological Flora of the British Isles: Rubus vestitus Weihe. Journal of Ecology, 93, 1249–1262.
Taylor, K. (2009) Biological Flora of the British Isles: Urtica dioica L. Journal of Ecology, 97, 1436–1458.
