APA (7th ed.) Citation

International Labour Office. (1969). International standard classification of occupations: International Labour Office (Rev. ed. 1968.). The Office.

Chicago Style (17th ed.) Citation

International Labour Office. International Standard Classification of Occupations: International Labour Office. Rev. ed. 1968. Geneva: The Office, 1969.

MLA (8th ed.) Citation

International Labour Office. International Standard Classification of Occupations: International Labour Office. Rev. ed. 1968. The Office, 1969.