‘Thornless Evergreen’ — Oregon’s Leading Blackberry. Journal of the American Pomological Society, [S. l.], v. 31, n. 2, p. 26–30, 1977. DOI: 10.71318/apom.1977.31.2.26. Disponível em: https://journal.americanpomological.org/index.php/jofaps/article/view/1333. Acesso em: 13 feb. 2026.