DOT, I think bats and nelim already nailed it.
The one thing that is clear, is that the WT writers do not understand how to use quotes correctly, honestly or even with appropriate academic/journalistic attribution.
The WT leadership cultivates a mythical image of "scholarship" among themselves and their writers, but the fact is they would fail any freshman high school assignment in any subject for abject plagiarism.
That being said, I think it's a really good exercise to track down the source of the quotes, which is not made easy because the WT doesn't cite their sources properly--if they do it at all.
Learning to think critically and to think for ourselves is one of the best gifts we can ever give ourselves!