Size of Blackjon Apple. Journal of the American Pomological Society, [S. l.], v. 5, n. 2, p. 39–41, 1950. DOI: 10.71318/apom.1950.5.2.39. Disponível em: https://journal.americanpomological.org/index.php/jofaps/article/view/2173. Acesso em: 16 dec. 2025.