Walker, G.P., P.J. Workman, M.A.W. Stufkens, P.J. Wright, J.D. Fletcher, M.S. Qureshi, and S.I. Davis. “Integrated Pest and Disease Management (IPM) for Outdoor Lettuce”. New Zealand Plant Protection 56 (August 1, 2003): 269–269. Accessed January 20, 2022. https://journal.nzpps.org/index.php/nzpp/article/view/6072.