Stallknecht, N. P. (1971). George Santayana. University of Minnesota Press.
芝加哥风格引文Stallknecht, Newton P. George Santayana. Minneapolis: University of Minnesota Press, 1971.
MLA引文Stallknecht, Newton P. George Santayana. University of Minnesota Press, 1971.
警告：这些引文格式不一定是100％准确.