Pennsylvania State University offers book on propogating nut trees. Journal of the American Pomological Society, [S. l.], v. 26, n. 3, p. 71–71, 1972. DOI: 10.71318/apom.1972.26.3.71. Disponível em: https://journal.americanpomological.org/index.php/jofaps/article/view/1133. Acesso em: 8 feb. 2026.