APA (7th ed.) Citation

Koening, E. S. C. a. L. W. The presidency today. New york university press.

Chicago Style (17th ed.) Citation

Koening, Edward S. Corwin and Lois W. The Presidency Today. New york university press.

MLA (8th ed.) Citation

Koening, Edward S. Corwin and Lois W. The Presidency Today. New york university press.

Warning: These citations may not always be 100% accurate.