Mezinárodní úřad práce. Year book of labour statistics 1991 = Annuaire des statistiques du travail 1991 = Anuario de estadisticas del trabajo 1991 / International Labour Office. 50th ed. Geneva: International Labour Office, 1991. 1132 s.
(1991). Year book of labour statistics 1991 =: Annuaire des statistiques du travail 1991 = Anuario de estadisticas del trabajo 1991 / International Labour Office (50th ed.). Geneva: International Labour Office.
Styl ChicagoYear Book of Labour Statistics 1991 =: Annuaire Des Statistiques Du Travail 1991 = Anuario De Estadisticas Del Trabajo 1991 / International Labour Office. 50th ed. Geneva: International Labour Office, 1991.
Citace podle MLAYear Book of Labour Statistics 1991 =: Annuaire Des Statistiques Du Travail 1991 = Anuario De Estadisticas Del Trabajo 1991 / International Labour Office. 50th ed. Geneva: International Labour Office, 1991.
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