As a history graduate I can only say my sources were researched properly and thoroughly using multiple books, journal articles and where relevant...newspapers. I think it depends largely on what the subject is you're studying but I would have been in hot water for quoting from wikipedia or referencing a source on wikipedia.
Professors/Lecturers aren't stupid either, they know an original put together piece of work from something they will have likely read on the subject already so its obviously very core and important that what you're giving to them came from your mind but with sources and references to back up what you've done.
Blindly referencing someone else's work that much really isn't showing the effort required and if everyone could get away with it...what is anyone really learning? So yeah, quite the academic faux pas
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