Cita APA (7a ed.)

Santayana, G. (1933). Some turns of thought in modern philosophy, five essays. University press.

Cita Chicago Style (17a ed.)

Santayana, George. Some Turns of Thought in Modern Philosophy, Five Essays. Cambridge: University press, 1933.

Cita MLA (9a ed.)

Santayana, George. Some Turns of Thought in Modern Philosophy, Five Essays. University press, 1933.