Uses sources from researchers and historians from different areas of study. Some art historians she cites include Fredick Antal, Fritz Novotny and AM Hammacher who explains Van Gogh's artwork based on his emotions and feelings. He also cites researchers such as doctors, philosophers such as Karl Jaspers, Rey and Peyron as well as writers such as Meyer Schapiro who tries to look at his works on a psychological level. The quotes he takes are relatively long and can take up to half a page and are quotes which he later ignores and claims are incorrect. In this way, he is proving that he is right and that researchers need to delve deeper into the meaning. The tone of voice that Pollock uses in his article is formal but at the same time highly persuasive. For much of his writing, he takes a quote from his source and argues against it, which some readers may wonder who is right. He also constantly references Van Gogh and the points he had made previously to try to get the point across. Pollock references his previous points, perhaps to try to emphasize the point he is trying to make, as well as underlining its importance to art.