As the controversy went further, the Wikipedia community began looking at Essjay's previous changes. Some felt he had relied upon his false professorship to prove he was right about his changes. "People have gone through his edits and found places where he was basically cashing in on his fake credentials to bolster his arguments," said Michael Snow, a Wikipedia administrator and founder of the Wikipedia community newspaper, "The Wikipedia Signpost". "Those will get looked at again." For instance, Essjay had recommended sources such as "Catholicism for Dummies," a book granted the nihil obstat and imprimatur by the Roman Catholic Church. Essjay defended his use of the book by telling fellow Wikipedia editors in a disagreement over the editing of the article Imprimatur: "This is a text I often require for my students, and I would hang my own PhD on it’s credibility."