If there are no sources for any of the data, then, unfortunately, each piece would need to be verified through other documents. Sorry, but that's the only way to make sure the tree is accurate.

You MIGHT be able to match some data to other trees BUT those would need to have thorough, reliable sources (i.e., if you just find the info in other unsourced trees, then nothing is proven and it's still unreliable.)

DO NOT, however, get discouraged and throw any papers out! There's still probably valuable info in them, even if they are not documented.