On the main site, a user wrote an answer with a note at the end on the following lines. This answer received several upvotes and is also accepted by OP.
Note: Some portions of this answer are compiled from various sources on the Internet. Consider this answer either partial or unsourced. As much as possible, I made an honest attempt to state the correct info. I will update my answer if better (i.e., more correct) translations are available...
Should we let users leave such disclaimers and promissory notes in their answers and get away from their obligation to cite proper sources right when the answers are posted?
Because in practice, we rarely find users coming back and updating their answers with the right sources...