You re asking him to prove a negative The WP BURDEN is one the one who wants to include a statement like this There are no sources saying that most towns are not sundown towns My conclusion after doing quite a bit of research is that Loewen is indeed alone in defining sundown towns this way and thus his work alone is not sufficient to include it However his book and essays are widely discussed in other reliable sources which to me as I explained above means it makes sense to include the term as long as it s attributed to him