Workman, P.J., G.P. Walker, and S. Winkler. “Incidence and Control of Thrips on Outdoor Lettuce at Pukekohe”. New Zealand Plant Protection 60 (August 1, 2007): 42–49. Accessed November 29, 2021. https://journal.nzpps.org/index.php/nzpp/article/view/4607.