More allegations of plagiarism in other Driscoll works soon surfaced, including passages from a sermon series companion text, "Trial: 8 Witnesses From 1&2 Peter", which were copied verbatim from passages written by David Wheaton in the "New Bible Commentary". InterVarsity Press, publisher of the "New Bible Commentary", stated that Driscoll failed to properly provide quotation or attribution for the material. The relevant passages were posted online. The allegations soon expanded to include claims that Driscoll used ghostwriters and researchers without giving them proper attribution. As of December 2013, neither Peter Jones, D.A. Carson, nor Janet Mefferd had made any further statements pertaining the case.