The Penn State Low Trellis Hedgerow System of Apple Production. Journal of the American Pomological Society, [S. l.], v. 37, n. 3, p. 62–79, 1983. DOI: 10.71318/apom.1983.37.3.62. Disponível em: https://journal.americanpomological.org/index.php/jofaps/article/view/1509. Acesso em: 14 dec. 2025.