Douglas, M. (1996). Natural symbols: Explorations in cosmology. Routledge.
芝加哥风格引文Douglas, Mary. Natural Symbols: Explorations in Cosmology. London ; New York: Routledge, 1996.
MLA引文Douglas, Mary. Natural Symbols: Explorations in Cosmology. Routledge, 1996.
警告：这些引文格式不一定是100％准确.