Cita APA (7a ed.)

(1930). The coal industry of the world: With special reference to international trade in Coal. Government Printing Office.

Cita Chicago Style (17a ed.)

The Coal Industry of the World: With Special Reference to International Trade in Coal. Washington: Government Printing Office, 1930.

Cita MLA (8a ed.)

The Coal Industry of the World: With Special Reference to International Trade in Coal. Government Printing Office, 1930.