GRZYBOWSKI, A. [The history of cocaine in medicine and its importance to the discovery of the different forms of anaesthesia]. Klin Oczna.. 2007, roč. 109, čís. 1–3, s. 101–5. Dostupné online. ISSN0023-2157.
nytimes.com
MAY, Clifford D. How Coca-Cola Obtains Its Coca. The New York Times. 1988-07-01. Dostupné online [cit. 2017-08-16]. ISSN0362-4331. (anglicky)
Kokain začal na ulici konkurovat pervitinu, gram stojí 1200 korun - Miloval ho Hugo Haas. Novinky.cz [online]. Borgis [cit. 2008-03-07]. Dostupné v archivu pořízeném dne 2008-04-11.
worldcat.org
GRZYBOWSKI, A. [The history of cocaine in medicine and its importance to the discovery of the different forms of anaesthesia]. Klin Oczna.. 2007, roč. 109, čís. 1–3, s. 101–5. Dostupné online. ISSN0023-2157.
MAY, Clifford D. How Coca-Cola Obtains Its Coca. The New York Times. 1988-07-01. Dostupné online [cit. 2017-08-16]. ISSN0362-4331. (anglicky)