Gordon, C. H. (1972). Before Columbus: Links between the old world and ancient America. Turnstone Press.
芝加哥风格引文Gordon, Cyrus H. Before Columbus: Links Between the Old World and Ancient America. London: Turnstone Press, 1972.
MLA引文Gordon, Cyrus H. Before Columbus: Links Between the Old World and Ancient America. Turnstone Press, 1972.
警告：这些引文格式不一定是100％准确.