SHAW, Judith. Medb, Celtic Sovereignty Goddess of War and Fertility [online]. Feminism and Religion, 2014-08-31 [cit. 2024-05-31]. Dostupné online. (anglicky)
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KOCH, John T. Celtic Culture: A Historical Encyclopedia [5 Volumes]. [s.l.]: Bloomsbury Academic 2187 s. Dostupné online. ISBN978-1-85109-440-0. (anglicky) Google-Books-ID: f899xH_quaMC.
GIBSON, Marion; ESRA, Jo Ann. Shakespeare's Demonology: A Dictionary. 1. vyd. [s.l.]: Bloomsbury Publishing, 2014. 249 s. Dostupné online. ISBN978-1780936185. (anglicky) Google-Books-ID: wni9AgAAQBAJ.
LIEBER, Francis; WIGGLESWORTH, Edward; BRADFORD, Thomas Gamaliel. Encyclopaedia Americana: A Popular Dictionary of Arts, Sciences, Literature, History, Politics and Biography, Brought Down to the Present Time; Including a Copious Collection of Original Articles in American Biography. [s.l.]: Nabu Press, 2011. 646 s. Dostupné online. ISBN978-1173709570. (anglicky) Google-Books-ID: 5sVPAAAAMAAJ.