APA
United State. State (Department of __), United State. State (Department of __), . (1949). Energy resources of the world. : .
Chicago
United State. State (Department of __), United State. State (Department of __), . 1949. Energy resources of the world. : .
Harvard
United State. State (Department of __), United State. State (Department of __), . (1949). Energy resources of the world. : .
MLA
United State. State (Department of __), United State. State (Department of __), . Energy resources of the world. : . 1949.