APA (7th ed.) Citation

International Labor Office. (1969). International standard classification of occupations (Rev. ed. 1968.). [s.n.].

Chicago Style (17th ed.) Citation

International Labor Office. International Standard Classification of Occupations. Rev. ed. 1968. Geneva: [s.n.], 1969.

MLA (9th ed.) Citation

International Labor Office. International Standard Classification of Occupations. Rev. ed. 1968. [s.n.], 1969.