I want to imrprove the quality of my trees by removing all "sources" (and citations to same) that are unreliable, often inaccurate, or otherwise not suitable for someone trying to exercise due diligence.

I have already removed all citations using "Public Member Trees" as a source.

I think there are more sources that may need to be removed from my trees. Please help by listing sources you consider unauthoritative.

For example:
- AGBI (American Genealogical Biographical Index: use or avoid/ignore?
- Dictionary of National Biography: use or avoid/ignore?
- Family Data Collection(s) - Birth, Death, Marriage, Individual Records: use or avoid/ignore?

What other "sources" fall in this category?

Thanks!