Citazione Stile APA (7a Edizione)

(1929). Wages and hours of work in the coal-mining industry in 1927: I. International Labour Organization.

Citazione stile Chigago Style (17a edizione)

Wages and Hours of Work in the Coal-mining Industry in 1927: I. International Labour Organization, 1929.

Citatione MLA (9a ed.)

Wages and Hours of Work in the Coal-mining Industry in 1927: I. International Labour Organization, 1929.