Zacarias-Correa, A. G., Guzmán-Díaz, S., & Pérez-Calix, E. (2019). Taxonomy, and geographic and ecological distribution of the genus Penstemon (Plantaginaceae) in the Trans-Mexican Volcanic Belt, Mexico. Instituto de Ecología, A.C.
Chicago-referens (17:e uppl.)Zacarias-Correa, Ana Gabriela, Salvador Guzmán-Díaz, och Emmanuel Pérez-Calix. Taxonomy, and Geographic and Ecological Distribution of the Genus Penstemon (Plantaginaceae) in the Trans-Mexican Volcanic Belt, Mexico. Instituto de Ecología, A.C, 2019.
MLA-referens (9:e uppl.)Zacarias-Correa, Ana Gabriela, et al. Taxonomy, and Geographic and Ecological Distribution of the Genus Penstemon (Plantaginaceae) in the Trans-Mexican Volcanic Belt, Mexico. Instituto de Ecología, A.C, 2019.
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