Bernard, J., Cerqueira, S., Gilhodes, P., Graillot, H., Manigat, L. F., Neira Samanez, H. 1., & Perl, M. (1973). Guide to the political parties of South America. Harmondsworth: Penguin Books.

Bernard, Jean-Pierre, Silas Cerqueira, Pierre Gilhodes, Hélène Graillot, Leslie Francois Manigat, Hugo 1936- Neira Samanez, and Michael Perl. Guide to the Political Parties of South America. Harmondsworth: Penguin Books, 1973.

Bernard, Jean-Pierre, et al. Guide to the Political Parties of South America. Harmondsworth: Penguin Books, 1973.