All sources were referenced, if you'd bother to click on the link. I've done all different kind of IQ tests in my life, starting from the age of 10, and my last one in my mid-40s. All of them gave me more or less the same score. What was interesting is one that was multi-cultural and didn't require an education. It was designed by a doctorate student at Harvard.

I was given 5 hours (or more time if I needed it). I had EEG goodies linked to my brain and did the test on a computer. I completed it in 90 minutes, and later did many other tests. That score was substantially higher than the other tests,