Varieties in Apple Collection at Pennsylvania State College. Journal of the American Pomological Society, [S. l.], v. 2, n. 3, p. 82–82, 1947. DOI: 10.71318/apom.1947.2.3.82. Disponível em: https://journal.americanpomological.org/index.php/jofaps/article/view/772. Acesso em: 13 dec. 2025.