Roberts, Andrew: ”Kofola”, From Good King Wenceslas to the Good Soldier Švejk: A Dictionary of Czech Popular Culture, s. 78. Budapest: Central European University Press, 2005. Teos Questia-tietopalvelussa (vaatii tilauksen). (Arkistoitu – Internet Archive)
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Roberts, Andrew: ”Kofola”, From Good King Wenceslas to the Good Soldier Švejk: A Dictionary of Czech Popular Culture, s. 78. Budapest: Central European University Press, 2005. Teos Questia-tietopalvelussa (vaatii tilauksen). (Arkistoitu – Internet Archive)