APA (7th ed.) Citation

Sobel, R. (1990). Biographical directory of the United States executive branch, 1774-1989. Greenwood Press.

Chicago Style (17th ed.) Citation

Sobel, Robert. Biographical Directory of the United States Executive Branch, 1774-1989. New York: Greenwood Press, 1990.

MLA (9th ed.) Citation

Sobel, Robert. Biographical Directory of the United States Executive Branch, 1774-1989. Greenwood Press, 1990.

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