Wright, P.J., G.P. Walker, and D.I. Hedderley. “Effects of Sulphur on Control of Tomato Potato Psyllid in Potato”. New Zealand Plant Protection 66 (January 8, 2013): 386–386. Accessed July 3, 2022. https://journal.nzpps.org/index.php/nzpp/article/view/5701.