New Life for Old ‘Spy’ Trees. Journal of the American Pomological Society, [S. l.], v. 27, n. 4, p. 91–93, 1973. DOI: 10.71318/apom.1973.27.4.91. Disponível em: https://journal.americanpomological.org/index.php/jofaps/article/view/1165. Acesso em: 8 dec. 2025.