Cummings, C. (1991). Eco-spirituality: Toward a reverent life. Paulist Press.
芝加哥风格引文Cummings, Charles. Eco-spirituality: Toward a Reverent Life. Mahwah, New Jersey: Paulist Press, 1991.
MLA引文Cummings, Charles. Eco-spirituality: Toward a Reverent Life. Paulist Press, 1991.
警告：这些引文格式不一定是100％准确.