The last line of the first paragraph used to read "Ludwig Wittgenstein alternately called this position referentialism." To my knowledge he didn't. The citations used to support that claim were improper. One referenced Severin Schroeder, who does call the position referentialism, and does talk about Wittgenstein, although he never says that Wittgenstein calls the position referentialism. The other citation referred to the article by Kallestrup, who doesn't talk about Wittgenstein at all. I assumed the point of the sentence was to mention Wittgenstein, because the fact that direct reference theories are sometimes called referentialism had already been mentioned so I changed it to "Criticisms of this position are often associated with Ludwig Wittgenstein." If I am wrong about Wittgenstein's use of the term 'referentialism' then at the very least some primary source is required.