Oregon’s OP-9 Bartlett Pear. Journal of the American Pomological Society, [S. l.], v. 21, n. 1, p. 18–19, 1967. DOI: 10.71318/apom.1967.21.1.18. Disponível em: https://journal.americanpomological.org/index.php/jofaps/article/view/847. Acesso em: 1 feb. 2026.