Porteous, I. R. (1969). Topological geometry (1969). Van Nostrand Reinhold.
芝加哥风格引文Porteous, Ian Robertson. Topological Geometry (1969). London: Van Nostrand Reinhold, 1969.
MLA引文Porteous, Ian Robertson. Topological Geometry (1969). Van Nostrand Reinhold, 1969.
警告：这些引文格式不一定是100％准确.