APA Style

Santayana, G. (2002). The Letters of George Santayana, Book Two, 1910–1920: The Works of George Santayana, Volume V (1). Philosophers: Cambridge, Mass. : MIT Press,.

MLA Style

Santayana, George,. "The Letters of George Santayana, Book Two, 1910–1920: The Works of George Santayana, Volume V". 1 Philosophers: Cambridge, Mass. : MIT Press,, 2002. Text.