Widdup, K.H., J.R. Caradus, J. Green, and Mueller Pennell. 1996. “White Clover Ecotype Germplasm from the USA for Development of New Zealand and Overseas Cultivars”. NZGA: Research and Practice Series 6 (January):149-53. https://doi.org/10.33584/rps.6.1995.3356.