1. Draught beer quality - challenges and opportunities;Quain;Proc. Eur. Brew. Conv. Congr. Venice,2007
2. Beer Quality Report 2016 http://cask-marque.co.uk/beer-drinkers/beer-quality-report-2016
3. Beer Quality Report 2017 http://vianetplc.com/beer-quality-report-2017/
4. Cask Marque via http://cask-marque.co.uk/