Harmer, M., A.V. Stewart, and D.R. Woodfield. “Genetic Gain in Perennial Ryegrass Forage Yield in Australia and New Zealand”. Journal of New Zealand Grasslands 78 (January 1, 2016): 133–138. Accessed November 6, 2026. https://www.nzgajournal.org.nz.myth.agency/index.php/JoNZG/article/view/514.