C., & Wayne, S.J. (2010). Presidential leadership. (8 ed., pp. 528-536). Boston, MA: Cengage Wadsworth. Ellis, R. J., & Nelson, M. (2010). Debate over the presidency: Conflicting perspectives on the American executive branch. (pp. 137-153). Washington, DC: CQ Press.Halstead, TJ American Law Division. (2007).Presidential Signing Statements: Constitutional and Institutional Implications (Order Code RL33667)Congressional Research Service.Kelley, C.S. (2007). The law: contextualising the signature declaration. Presidential Studies Quarterly, 37(4), 737-748. Retrieved from http://www.jstor.org/stable/27552286 Kinkopf, N. (2006). Signing declarations and the president's authority to refuse to enforce the law. American Constitution Society for Law and Policy Lee, M. (2008). Refocusing the debate on presidential signature statements: The need for transparency in the president's constitutional objections, reservations, and assertions of power. Manuscript submitted for publication, School of Law, UCLA, retrieved from http://www.uclalawreview.org/wordpress/?p=339Lund, N. (2007). Presidential signature statements in perspective.William & Mary Bill of Rights Journal, 16(1),