O'Donnell, M., & Vickers, G. R. e. S. El Salvador elections 1994: Voter registration progress and the tasks ahead. Hemisphere Initiatives.

O'Donnell, Madelene, and George R ed. Spence Vickers. El Salvador Elections 1994: Voter Registration Progress and the Tasks Ahead. Cambridge: Hemisphere Initiatives.

O'Donnell, Madelene, and George R ed. Spence Vickers. El Salvador Elections 1994: Voter Registration Progress and the Tasks Ahead. Hemisphere Initiatives.