1. Volume of World Beer Production. European Beer Guide. Archived from the original on 28th October 2006, Retrieved 17 October 2006
2. M.
Nelson
, The Barbarian’s Beverage: a History of Beer in Ancient Europe, Routledge, Abingdon, 2005, ISBN 0-415-31121-7
3. R.
Rudgley
, The Alchemy of Culture: Intoxicants in Society, British Museum Press, London, 1993, ISBN 978-0-7141-1736-2
4. J. P.
Arnold
, Origin and History of Beer and Brewing, Beerbooks, Cleveland, 2005, ISBN 0-9662084-1-2
5. J. M.
Joshua
, Beer - Ancient history encyclopedia, 2011, http://www.ancient.eu/Beer/, last access on October 2015