Plagiarism is when you take a person's work and pass it as your own work even if you took permission from its owner. Yes, even if a person gives you permission to use their work, you must not pass it as your own as this is plagiarism. You must credit the owner for the work.
I am unsure as to what forms of documentation the question speaks of but if that documentation relates to crediting the original owner for the work and it is missing, then the assignment is plagiarized because it is being passed along as your own even though it isn't. Even if this was not intentional, it is still plagiarism.
This is plagiarism because without the list of documentation you are claiming that you got those facts or ideas yourself, therefore you are say it is your work when it is not.
Dear Mr. District officer, Crime in our neighborhood has risen to an all time high since the shortage of street lights in the area. I fear for not only my life but my family’s. It is obligatory to put these lights back up to put an end to the heinous acts that are occurring in our streets.
