Sources:
- w:Category:Comparison shopping websites
- http://www.marketingdonut.co.uk/marketing/marketing-strategy/pricing/a-guide-to-price-comparison-websites
- http://paler.com/price_comparison.html - for UK
Gonna need to differentiate direct-book sites from indirect-book ( i.e. you need to log-in elsewhere to book ). --Juboxi (talk) 15:42, 3 January 2015 (EET)