International Labor Office. (1952). International classification of occupations for migration and employment placement. s.n.
Chicago-Zitierstil (17. Ausg.)International Labor Office. International Classification of Occupations for Migration and Employment Placement. Geneva: s.n, 1952.
MLA-Zitierstil (9. Ausg.)International Labor Office. International Classification of Occupations for Migration and Employment Placement. s.n, 1952.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.