Is it just me, or are textbooks a Ti > Te medium? My reasons are: stuff is usually presented categorically/causally and with a slant toward a certain opinion, even though both are often not really true and subject to debate/interpretation. I always use my textbooks as frisbees because I think the info in them is BS. Like, is that really true according to present research? I bet every other line that is said definitively is actually a topic of controversy.
I prefer primary sources and Wikipedia.
For VI purposes: