-
1by Regional Seminar on Statistics of Culture and Mass Communication in Africa, Addis Ababa, 1972, Fansten, Michel, Nissel, M.programme and meeting document bibliotecaUNESCO
-
2by Regional Seminar on Statistics of Culture and Mass Communication in Africa, Addis Ababa, 1972, Fansten, Michel, Nissel, M.programme and meeting document bibliotecaUNESCO