APA

Voskuil W., . (1943). The first century and a quarter of american coal industry. New York-US: Geografical record.

Chicago

Voskuil Walter, . 1943. The first century and a quarter of american coal industry. New York-US: Geografical record.

Harvard

Voskuil W., . (1943). The first century and a quarter of american coal industry. New York-US: Geografical record.

MLA

Voskuil Walter, . The first century and a quarter of american coal industry. New York-US: Geografical record. 1943.