APA (7th ed.) Citation

Ortega y Gasset, J. (1961). History as a system: And other essays toward a philosophy of history. Greenwood Press.

Chicago Style (17th ed.) Citation

Ortega y Gasset, José. History as a System: And Other Essays Toward a Philosophy of History. Westport, Conn: Greenwood Press, 1961.

MLA (9th ed.) Citation

Ortega y Gasset, José. History as a System: And Other Essays Toward a Philosophy of History. Greenwood Press, 1961.

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