Posadas, J. (1977). The Meeting of the Socialist International: The Congress of the Spanish P.S.O.E. and the World Process of the Revolution. Revolutionary Party Workers (Trotskyist).

Posadas, J. The Meeting of the Socialist International: The Congress of the Spanish P.S.O.E. and the World Process of the Revolution. London: Revolutionary Party Workers (Trotskyist), 1977.

Posadas, J. The Meeting of the Socialist International: The Congress of the Spanish P.S.O.E. and the World Process of the Revolution. Revolutionary Party Workers (Trotskyist), 1977.