APA

Zink H., . (1961). Government and politics in the United States. Estados Unidos: D Van Nostrand Company.

Chicago

Zink Harold, . 1961. Government and politics in the United States. Estados Unidos: D Van Nostrand Company.

Harvard

Zink H., . (1961). Government and politics in the United States. Estados Unidos: D Van Nostrand Company.

MLA

Zink Harold, . Government and politics in the United States. Estados Unidos: D Van Nostrand Company. 1961.