Cita APA (7a ed.)

(1931). Wages and hours of work in the coal-mining industry in 1929. International Labour Organization.

Cita Chicago Style (17a ed.)

Wages and Hours of Work in the Coal-mining Industry in 1929. International Labour Organization, 1931.

Cita MLA (9a ed.)

Wages and Hours of Work in the Coal-mining Industry in 1929. International Labour Organization, 1931.