Wikipedia contributors: «Adyen», Wikipedia, The Free Encyclopedia, accessed April 1, 2016: en.wikipedia.org/wiki/Adyen
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Jason Del Rey «Adyen Is the $2 Billion Payments Startup You’ve Never Heard Of (Unless You’re a Payments Nerd)», Recode, January 14, 2016: recode.net/2016/01/14/adyen-is-the-billion-payments-startup-youve-never-heard-of-unless-youre-a-payments-nerd/
