Discuss irony (dramatic, situational, verbal) in Oedipus Rex by Sophocles.

Discuss irony (dramatic, situational, verbal) in Oedipus Rex by Sophocles. Assume that the audience has already read and discussed the story (no summary of story needed). Two of the outside sources may come from an authoritative web site, but at least one source must come from a juried or peer reviewed print work (book, journal article, or essay) or article from a library database.