(en) « Ed Sanders of the Fugs on Marianne Faithfull, Jean de Breteuil, and Jim Morrison’s death », sur Dangerous Minds, . : « In the summer of 1970, Pamela was living with de Breteuil, a French count and heroin dealer, in Los Angeles. When Janis Joplin overdosed on de Breteuil’s uncut shit, he freaked out and fled with Courson to Paris; Pam left Jim a note, “which upon reading he burned.” »
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(en) Stephen Davis, Jim Morrison: Life, Death, Legend, Random House, , 512 p. (lire en ligne).
(en) George Rush et al., Stones Exile on Main-Line Street, New York Daily News, September 18, 2006 : « Jean de Breteuil, Janis Joplin's drug dealer and lover of Jim Morrison's wife, Pamela. He brought pink Thai heroin in women's powder compacts ».
(en) Jean de Breteuil Snapshot : « Jean was a horrible guy, someone who had crawled out from under a stone. Somehow I ended up with him… it was all about drugs and sex. » (Jean était un type horrible, un cafard sorti de l'ombre. J'ai fini par me mettre avec lui… tout ça c'était uniquement une question de drogue et de sexe).