APA

Hatfield M. O., Wolff W., . (1997). Vice Presidents of the United States, 1789-1993. Washington, D.C: U.S. Government Printing Office.

Chicago

Hatfield Mark O, Wolff Wendy, . 1997. Vice Presidents of the United States, 1789-1993. Washington, D.C: U.S. Government Printing Office.

Harvard

Hatfield M. O., Wolff W., . (1997). Vice Presidents of the United States, 1789-1993. Washington, D.C: U.S. Government Printing Office.

MLA

Hatfield Mark O, Wolff Wendy, . Vice Presidents of the United States, 1789-1993. Washington, D.C: U.S. Government Printing Office. 1997.