International Conference of Labor Statisticians (1st : 1923 : Geneva), International Labor Office, International Labor Office, International Labour Office, International Labour Office, International Conference of Labor Statisticians (1st : 1923 : Geneva), . . . International Conference on Labour Statisticians (2nd : 1925 : Geneva). (1975). Systems of classification of industries and occupations. Kraus Reprint.
Chicago Style (17th ed.) CitationInternational Conference of Labor Statisticians (1st : 1923 : Geneva), et al. Systems of Classification of Industries and Occupations. Nendeln: Kraus Reprint, 1975.
MLA (9th ed.) CitationInternational Conference of Labor Statisticians (1st : 1923 : Geneva), et al. Systems of Classification of Industries and Occupations. Kraus Reprint, 1975.