I'm looking for a reviewed source on the amount of money in the world As in title, I'm looking for a paper estimating the amount of all money in the world, sum of value of all national currencies or something like this.

When I google it, I find only pop-science curiosities, but I need hard data to quote.
If you're looking for total value of banknotes and coins in circulation, then the Bank for International Settlements provides some useful statistics. While the BIS only collects data on ~20 countries including the EU, the noted countries cover almost all of the value of banknotes and coins in circulation as of now. At the end of 2017, the total amount in USD is $6.458 trillion.