Visa Europe: Interchange poplatky v Ceske republice
Federal Reserve Bank of Kansas City: Interchange poplatky u platebnich karet ve vybranych zemich
Visa Europe: Transakce a mobilni platby v roce 2012
QIPS: Visa Qiwi Wallet
VISA: Global Merchant Offer Program 2013
Cebia Autotracer vs. VinCheck vs. autoDNA