APA (7th ed.) Citation

Pitkin, T. M. (1975). Keepers of the gate: A history of Ellis Island. New York University Press.

Chicago Style (17th ed.) Citation

Pitkin, Thomas M. Keepers of the Gate: A History of Ellis Island. New York: New York University Press, 1975.

MLA (9th ed.) Citation

Pitkin, Thomas M. Keepers of the Gate: A History of Ellis Island. New York University Press, 1975.