referencing question

am about to email my tutor about this, but thought i'd ask you guys as well
If i want to quote from an article, but the quotation is actually a quotation that the author has quoted from another article, do i reference the article that i've read, or the original article that the author quoted from??
If i want to quote from an article, but the quotation is actually a quotation that the author has quoted from another article, do i reference the article that i've read, or the original article that the author quoted from??
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Comments
Joe Bloggs, as cited by A.N. Other, Book Title, (Place of publication, date) p. 100.
But try and get hold of the original if you can - might help you with the background etc.