International Labor Office & International Conference of Labour Statisticians. (1957). International standard classification of occupations. Appendix VII: Draft Definitions. Second iten on the agenda. Report prepared for the ninth International Conference of Labour Statisticians, Geneva, April-May, 1957. [s.n.].
Chicago-viite (17. p.)International Labor Office ja International Conference of Labour Statisticians. International Standard Classification of Occupations. Appendix VII: Draft Definitions. Second Iten on the Agenda. Report Prepared for the Ninth International Conference of Labour Statisticians, Geneva, April-May, 1957. Geneva: [s.n.], 1957.
MLA-viite (9. p.)International Labor Office ja International Conference of Labour Statisticians. International Standard Classification of Occupations. Appendix VII: Draft Definitions. Second Iten on the Agenda. Report Prepared for the Ninth International Conference of Labour Statisticians, Geneva, April-May, 1957. [s.n.], 1957.