Piazzano, Marianela, Gabriel Bernardello, Lázaro Novara, Silvia R. Alarcón, Juana R. de la Fuente, and Miriam Hadid. 1998. “Evaluation of the Species Boundaries Between Parthenium Hysterophorus and P. Glomeratum (Asteraceae-Ambrosiinae): Morphological, Anatomical, Chromosomal and Phytochemical Evidence”. Anales Del Jardín Botánico De Madrid 56 (1):65-76. https://doi.org/10.3989/ajbm.1998.v56.i1.220.