Well, it depends how you define capitalist. I can’t so much provide links as talk you through the arguments I have. Most of those are generally accepted facts, we just need to be made aware of them. - What would be the first sign to look for when asking whether a country is capitalist as opposed to socialist? Property rights, of course. All of Scandinavia has very meticulous property rights. If you want a house or car, where do you get it? You buy it with money from a private person, who owns it. Then you own it. Scandinavia is exceptionally capitalist about all goods except health care and schooling. We have to keep in mind how unique that is. It’s not like that at all in most of the world, most countries don’t have secure property rights at all. Scandinavia really is at the fringe of propertarian societies in the world. In most of the world people don’t own their houses or shops, they are built illegally on government land and it’s near impossible to register an ownership claim because of the red tape and regulation. We think of poor countries as lawless, but they have have so much regulation that people can’t get anything done. The mark of a capitalist country is that it has done away with regulation and government expropriation the the point where people can do business and create wealth. Scandinavia is relatively benign when it comes to regulation, even compared to the US. You can open a business in a few weeks and there’s a lot less state meddling in affairs like how to build it.
We tend to call Scandinavia “socialist” because it has high income redistribution and welfare. But that is not socialism in the original meaning of the term. That would be ‘capitalism with welfare’. Another number that gets thrown around is inequality. Few socialists, however, seem to be aware of the distinction between income (the money you get every month) and wealth (the money you have). While Scandinavian countries have lower income inequality than the US, the do not generally have lower wealth inequality. And while the US has more relative poverty than Scandinavian countries, pretty much everyone in Scandinavia would be poor by American standards of living. Just that they are equally poor, so there is little relative poverty, which is a measure of how many people have an income below the average income.
I hope this somewhat answers your question, if not let me know what you wish to know specifically.
Here is the Heritage foundations list of countries by economic freedom, with all Scandinavian countries in the top 30 of the most free market capitalist countries in the world! http://www.heritage.org/index/ranking