(EN) CLAIRE GALOFARO e FRANCES D'EMILIO, Purdue foreign arm caught up in opioid probe in Europe, su apnews.com, The Associated Press, 29 maggio 2019. URL consultato il 5 agosto 2019.
«EXPERTS SAY THE STRATEGY IS REMINISCENT OF BIG TOBACCO'S GLOBAL EXPANSION WHEN IT FACED MOUNTING LEGAL PROBLEMS IN THE U.S.»