Childe, V. G., & Clark, G. (1942). What happened in history. Penguin books.
芝加哥风格引文Childe, V. Gordon, 与 Grahame Clark. What Happened in History. Baltimore: Penguin books, 1942.
MLA引文Childe, V. Gordon, 与 Grahame Clark. What Happened in History. Penguin books, 1942.
警告：这些引文格式不一定是100％准确.