APA

Ferguson J. H., McHenry D. E., . (1969). The American system of government. New York: McGraw-Hill.

Chicago

Ferguson John Henry, McHenry Dean Eugene, . 1969. The American system of government. New York: McGraw-Hill.

Harvard

Ferguson J. H., McHenry D. E., . (1969). The American system of government. New York: McGraw-Hill.

MLA

Ferguson John Henry, McHenry Dean Eugene, . The American system of government. New York: McGraw-Hill. 1969.