Colby, a Hardy Persian Walnut for the Central States. Journal of the American Pomological Society, [S. l.], v. 6, n. 4, p. 72–75, 1952. DOI: 10.71318/apom.1952.6.4.72. Disponível em: https://journal.americanpomological.org/index.php/jofaps/article/view/2624. Acesso em: 15 dec. 2025.