Rodriguez-Orellana, Manual. The Decolonization of Puerto Rico in Light of International Legal Precedents: A Case for Post-Independence Advocacy. Boston: Northeastern University School of Law, 1984. Tansill, Charles C. The Purchase of the Danish West Indies. Baltimore: Johns Hopkins University Press, 1932. Torruella, Juan R. The Supreme Court and Puerto Rico: The Doctrine of Separate and Unequal. Rio Piedras, Puerto Rico: Editorial de la Universidad de Puerto Rico, 1985. Voter Awareness of Political Status Options in the United States Virgin Islands. St. Thomas, U.S. Virgin Islands: Survey Research Unit, Caribbean Research Institute, University of the Virgin Islands, 1989. Zabriskie, Luther K. The Virgin Islands of the United States of America. New York and London: G.P. Putnam Sons, 1918.