“The Early Bearing and High Yield of Sweet Orange ( Citrus SinensisOsbeck) on Red Loam in Guangdong, China”. Journal of the American Pomological Society 39, no. 3 (July 1, 1985): 2–9. Accessed April 18, 2026. https://journal.americanpomological.org/index.php/jofaps/article/view/1590.