APA

United States, . (1971). Hearings before the Ad Hoc Advisory Group on the Presidential Vote for Puerto Rico. Washington, D.C: U. S. Government Printing Office.

Chicago

United States, . 1971. Hearings before the Ad Hoc Advisory Group on the Presidential Vote for Puerto Rico. Washington, D.C: U. S. Government Printing Office.

Harvard

United States, . (1971). Hearings before the Ad Hoc Advisory Group on the Presidential Vote for Puerto Rico. Washington, D.C: U. S. Government Printing Office.

MLA

United States, . Hearings before the Ad Hoc Advisory Group on the Presidential Vote for Puerto Rico. Washington, D.C: U. S. Government Printing Office. 1971.