PELLY, Jenn. Extremely Rare Velvet Underground Acetate Once Sold for $25,200 Is Going Back to Auction [online]. Pitchfork Media, 2014-03-22 [cit. 2016-03-24]. Dostupné online. (anglicky)
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JONES, Abby. R.I.P. Norman Dolph, Early Velvet Underground Producer Dead at 83. news.yahoo.com [online]. Yahoo! News, 2022-05-21 [cit. 2022-05-23]. Dostupné online. (anglicky)