APA

Hardy C. O., . (1936). Is there enough gold?. Washington: Brookings Institution.

Chicago

Hardy Charles Oscar, . 1936. Is there enough gold?. Washington: Brookings Institution.

Harvard

Hardy C. O., . (1936). Is there enough gold?. Washington: Brookings Institution.

MLA

Hardy Charles Oscar, . Is there enough gold?. Washington: Brookings Institution. 1936.