Clifford, P.T.P., M.P. Rolston, and W.M. Williams. “POSSIBLE SOLUTIONS TO CONTAMINATION OF WHITE CLOVER SEED CROPS BY BURIED SEED”. NZGA: Research and Practice Series 2 (January 1, 1985): 67–73. Accessed October 4, 2025. https://www.nzgajournal.org.nz/index.php/rps/article/view/3302.