1. Telefonica's Exploitation of Colombian Workers, the US-Colombia FTA, and the Labor Action Plan. A Case Study by the Communication Workers of America. Lugar de publicación: United States Editor: Communication Workers of America (CWA) Fecha: 2014
2. Confederation of the Latin American Christian Trade Unionists (CLASC). Lugar de publicación: United States Fecha: 1963
3. Trade Unionism as an Instrument of the Latin American Revolution. Lugar de publicación: United States Editor: Latin American Federation of Christian Trade Unions (CLASC) Fecha: 1970
