APA (7th ed.) Citation

Geneva. International Labour Office. (1968). International standard classification of occupations ([2nd] revised ed.). International Labour Organization.

Chicago Style (17th ed.) Citation

Geneva. International Labour Office. International Standard Classification of Occupations. [2nd] revised ed. Geneva: International Labour Organization, 1968.

MLA (9th ed.) Citation

Geneva. International Labour Office. International Standard Classification of Occupations. [2nd] revised ed. International Labour Organization, 1968.