Peña-Valdivia, Cecilia B., Mario Luna-Cavazos, José A. Carranza-Sabas, Juan A. Reyes-Agüero, and Arnoldo Flores. “Morphological Characterization of Opuntia spp.: A Multivariate Analysis”. Journal of the Professional Association for Cactus Development 10 (November 17, 2007): 1–21. Accessed February 24, 2026. https://jpacd.org/jpacd/article/view/116.