Engels, D. (2019). Oswald Spengler and the Decline of the West. Key thinkers of the radical right, 3-21.
芝加哥风格引文Engels, David. "Oswald Spengler and the Decline of the West." Key Thinkers of the Radical Right 2019: 3-21.
MLA引文Engels, David. "Oswald Spengler and the Decline of the West." Key Thinkers of the Radical Right, 2019, pp. 3-21.
警告：这些引文格式不一定是100％准确.
