“Rootstock and Scion Cultivar Interact to Affect Apple Tree Performance: A Five-Year Summary of the 1990 NC-140 Cultivar Rootstock Trial”. Journal of the American Pomological Society 50, no. 3 (July 1, 1996): 175–187. Accessed February 4, 2026. https://journal.americanpomological.org/index.php/jofaps/article/view/2227.