“Location Affects Performance of ‘Golden Delicious’, ‘Jonagold’, ‘Empire’, and ‘Rome Beauty’ Apple Trees on Five Rootstocks Over Ten Years in the 1990 NC-140 Cultivar/Rootstock Trial” (2001) Journal of the American Pomological Society, 55(3), pp. 138–145. doi:10.71318/apom.2001.55.3.138.