APA (7th ed.) Citation

International Labor Office. (1957). International standard classification of occupations: Codes and titles of major, minor and unit groups together with draft definitions and alphabetic index. [s.n.].

Chicago Style (17th ed.) Citation

International Labor Office. International Standard Classification of Occupations: Codes and Titles of Major, Minor and Unit Groups Together with Draft Definitions and Alphabetic Index. Geneva: [s.n.], 1957.

MLA (9th ed.) Citation

International Labor Office. International Standard Classification of Occupations: Codes and Titles of Major, Minor and Unit Groups Together with Draft Definitions and Alphabetic Index. [s.n.], 1957.