Scholars are agreed that there are differing genres in the Book of Jeremiah. They are not agreed about what to make of these differences. See John Bright, “The Date of the Prose Sermons of Jeremiah,” Journal of Biblical Literature (JBL) 70 (1951), pp. 15–35; Holladay, “A Fresh Look at ‘Source B’ and ‘Source C’ in Jeremiah,” Vetus Testamentum (VT) 25 (1975), pp. 394–412; and Michael J. Williams, “An Investigation of the Legitimacy of Source Distinctions for the Prose Material in Jeremiah,” JBL 112 (1993), pp. 193–210.