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Tarkanian, Michael J.; Hosler, Dorothy (2011). «America's First Polymer Scientists: Rubber Processing, Use and Transport in Mesoamerica». Latin American Antiquity. 22 (4): 469–486. ISSN1045-6635. JSTOR23072570. doi:10.7183/1045-6635.22.4.469
Rollins, Reed C. (1950). «The Guayule Rubber Plant and ITS Relatives». Contributions from the Gray Herbarium of Harvard University (172): 1–72. ISSN0195-6094. JSTOR41764789. doi:10.5962/p.336365
Gerstel, D. U.; Mishanec, Wm. (1950). «On the Inheritance of Apomixis in Parthenium argentatum». Botanical Gazette. 112 (1): 96–106. ISSN0006-8071. JSTOR2472768. doi:10.1086/335630
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Grunwald, Michael (27 de março de 2008). «The Clean Energy Scam». TIME. Arquivado do original em March 31, 2008Verifique data em: |arquivodata= (ajuda)
Tarkanian, Michael J.; Hosler, Dorothy (2011). «America's First Polymer Scientists: Rubber Processing, Use and Transport in Mesoamerica». Latin American Antiquity. 22 (4): 469–486. ISSN1045-6635. JSTOR23072570. doi:10.7183/1045-6635.22.4.469
Rollins, Reed C. (1950). «The Guayule Rubber Plant and ITS Relatives». Contributions from the Gray Herbarium of Harvard University (172): 1–72. ISSN0195-6094. JSTOR41764789. doi:10.5962/p.336365
Gerstel, D. U.; Mishanec, Wm. (1950). «On the Inheritance of Apomixis in Parthenium argentatum». Botanical Gazette. 112 (1): 96–106. ISSN0006-8071. JSTOR2472768. doi:10.1086/335630