APA

Clack G., . (2006). Outline of the U. S. Economy. [S.l.]: [s.n.].

Chicago

Clack G, . 2006. Outline of the U. S. Economy. [S.l.]: [s.n.].

Harvard

Clack G., . (2006). Outline of the U. S. Economy. [S.l.]: [s.n.].

MLA

Clack G, . Outline of the U. S. Economy. [S.l.]: [s.n.]. 2006.