APA (7th ed.) Citation

Purcell, L. E. (1998). The vice presidents: A biographical dictionary. Facts On File.

Chicago Style (17th ed.) Citation

Purcell, L. Edward. The Vice Presidents: A Biographical Dictionary. New York, NY: Facts On File, 1998.

MLA (9th ed.) Citation

Purcell, L. Edward. The Vice Presidents: A Biographical Dictionary. Facts On File, 1998.