International Labour Office. (1969). International standard classification of occupations: International Labour Office (Rev. ed. 1968.). The Office.
Цитирование в стиле Чикаго (17-е изд.)International Labour Office. International Standard Classification of Occupations: International Labour Office. Rev. ed. 1968. Geneva: The Office, 1969.
Цитирование MLA (8-е изд.)International Labour Office. International Standard Classification of Occupations: International Labour Office. Rev. ed. 1968. The Office, 1969.
Предупреждение: эти цитированмия не могут быть всегда правильны на 100%.