Universidad Pedagógica Nacional Unidad Ajusco Catálogo de la Biblioteca "Gregorio Torres Quintero"
by Records of the general conference (14a. : 1966 : Paris).
by Records of the general conference (4a. extraordinaria : 1982 : Paris).
by Records of the general conference (17a. : 1972 : Paris).
by Records of the general conference (21a. : 1980 : Belgrade).
by Records of the general conference (22a. : 1983 : Paris).
by Records of the general conference (23a. : 1985 : Sifia).
by Records of the General Conference (20th. : Paris : 1978).