“’Gala’ Apple Trees on Supporter 4, P.14, and Different Strains of B.9, M.9 and M.26 Rootstocks: Final 10-Year Report on the 2002 NC-140 Apple Rootstock Trial”. Journal of the American Pomological Society 67, no. 2 (April 1, 2013): 62–71. Accessed January 30, 2026. https://journal.americanpomological.org/index.php/jofaps/article/view/2826.