International Labour Office. (1969). International standard classification of occupations: International Labour Office (Rev. ed. 1968.). The Office.
Citace podle Chicago (17th ed.)International Labour Office. International Standard Classification of Occupations: International Labour Office. Rev. ed. 1968. Geneva: The Office, 1969.
Citace podle MLA (8th ed.)International Labour Office. International Standard Classification of Occupations: International Labour Office. Rev. ed. 1968. The Office, 1969.
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