- G. P. H. Chorley, “The Agricultural Revolution in Northern Europe, 1750-1880: Nitrogen, Legumes, and Crop Productivity.” The Economic History Review, vol. 34, no. 1, 1981, pp. 71–93. JSTOR, www.jstor.org/stable/2594840. Accessed 4 Jan. 2021.
- T. Kjaergaard, A plant that changed the world: The rise and fall of clover, 1000 – 2000, online resource
- Baude, M., Kunin, W., Boatman, N. et al. Historical nectar assessment reveals the fall and rise of floral resources in Britain. Nature 530,85–88 (2016)
See full list of Individual Species References.
Please also refer to the General Bibliography and Online Resources.