APA (7th ed.) Citation

Naciones Unidas. Comisión Económica para Europa. (1956). International classification of hard coals by type. United Nations, Department of Economic Affairs.

Chicago Style (17th ed.) Citation

Naciones Unidas. Comisión Económica para Europa. International Classification of Hard Coals by Type. Geneva: United Nations, Department of Economic Affairs, 1956.

MLA (9th ed.) Citation

Naciones Unidas. Comisión Económica para Europa. International Classification of Hard Coals by Type. United Nations, Department of Economic Affairs, 1956.