As far as I learned you need can quote word by word, showing changes like this:
Albert Einstein: "The Internet is a great invention."
Albert Einstein mentioned, that "[t]he Internet[sic] is a great invention." (Source)
OR you quote indirectly, like:
Albert Einstein is of the oppinion the internet is a great invention, as stated in the source.
But what if Albert Einstein, like the German that he was, spoke it in German? Would I be allowed to quote the translation word by word or would I have to paraphrase and do it the second way?
I was just curious becaus, especially in history in school, I saw a lot of English quotes translated into German, but still quoted as if they were spoken in German, which I was just curious if this is really allowed since school books should live up to those rules, shouldn't they?