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Muggli, M; Hurt, R; Becker, L (2004). "Turning free speech into corporate speech: Philip Morris' efforts to influence U.S. And European journalists regarding the U.S. EPA report on secondhand smoke". Preventive Medicine. 39 (3): 568–80. doi:10.1016/j.ypmed.2004.02.014. PMID15313097.
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Holmes, Paul (March 28, 1988). "35 Years at the helm"(PDF). PR Week. Archived from the original(PDF) on August 17, 2011. Retrieved January 27, 2011.
Hynum, Rick (Winter 2001). "Wagging the dog"(PDF). Ole Miss Alumni Review. Archived from the original(PDF) on August 17, 2011. Retrieved January 27, 2011.
Morales, Rubén. "Somos derechos y humanos" [We are right and humane]. Publicidad Politica (in Spanish). Archived from the original on March 21, 2009. Retrieved February 21, 2011.
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