PLUENNEKE , R. H. . Prickly pear work at the R. W. Williams Ranch in Dimmit County Texas in the 1960’s. Journal of the Professional Association for Cactus Development, [S. l.], p. 22–28, 1990. DOI: 10.56890/jpacd.vi.390. Disponível em: https://jpacd.org/jpacd/article/view/390. Acesso em: 7 dec. 2025.