Tozer, K. N., R. Greenfield, R. Grigson, C. Cameron, A. Roberts, E. Noakes, T. Rhodes, and S. Zydenbos. “Impact of Pasture Height and Herbage Mass on Suppression of Variegated Thistle in North Island East Coast Hill Country”. Journal of New Zealand Grasslands, vol. 82, Oct. 2020, pp. 83-90, doi:10.33584/jnzg.2020.82.439.