Universidad Pedagógica Nacional Unidad Ajusco Catálogo de la Biblioteca "Gregorio Torres Quintero"
by Conférence internationale de l´education (42a : 1990 : Geneve).
by Conference internationale de l´education (38a. ; 1981 : Geneve).
by Conference Internationale de l´education (43a. 1992 : Geneve).
by Conference Internationale de l´education (44a. 1994 : Geneve).