MUNTEAN, L. S.; SALONTAI, A.; TAMAS, M.; BOTEZ, C.; VAIDA, F. Research on the biology of Echinacea angustifolia (Dc.) Moench and Echinacea purpurea (L.) Moench. Notulae Botanicae Horti Agrobotanici Cluj-Napoca, [S. l.], v. 19, n. 1, p. 91–100, 1989. DOI: 10.15835/nbha191300. Disponível em: https://www.notulaebotanicae.ro/index.php/nbha/article/view/300. Acesso em: 2 oct. 2022.