APA

United States, . (1989). Political status of Puerto Rico: hearings before the Committee on Energy and Natural Resources, United States Senate, One Hundred First Congress, first session, on S. 710, S. 711, and S. 712. Washington: U.S. G.P.O.

Chicago

United States, . 1989. Political status of Puerto Rico: hearings before the Committee on Energy and Natural Resources, United States Senate, One Hundred First Congress, first session, on S. 710, S. 711, and S. 712. Washington: U.S. G.P.O.

Harvard

United States, . (1989). Political status of Puerto Rico: hearings before the Committee on Energy and Natural Resources, United States Senate, One Hundred First Congress, first session, on S. 710, S. 711, and S. 712. Washington: U.S. G.P.O.

MLA

United States, . Political status of Puerto Rico: hearings before the Committee on Energy and Natural Resources, United States Senate, One Hundred First Congress, first session, on S. 710, S. 711, and S. 712. Washington: U.S. G.P.O. 1989.