Cita APA (7a ed.)

International Labor Office. (1958). International standard classification of occupations. [s.n.].

Cita Chicago Style (17a ed.)

International Labor Office. International Standard Classification of Occupations. Geneva: [s.n.], 1958.

Cita MLA (9a ed.)

International Labor Office. International Standard Classification of Occupations. [s.n.], 1958.