APA

Roush G. A., . (1939). Strategic mineral supplies. New York: McGraw-Hill.

Chicago

Roush G A, . 1939. Strategic mineral supplies. New York: McGraw-Hill.

Harvard

Roush G. A., . (1939). Strategic mineral supplies. New York: McGraw-Hill.

MLA

Roush G A, . Strategic mineral supplies. New York: McGraw-Hill. 1939.