Underhill, E., & Williams, C. (1991). The letters of Evelyn Underhill (1. publ. in paperback in Great Britain.). Darton, Longman & Todd.
芝加哥风格引文Underhill, Evelyn, 与 Charles Williams. The Letters of Evelyn Underhill. 1. publ. in paperback in Great Britain. London: Darton, Longman & Todd, 1991.
MLA引文Underhill, Evelyn, 与 Charles Williams. The Letters of Evelyn Underhill. 1. publ. in paperback in Great Britain. Darton, Longman & Todd, 1991.
警告：这些引文格式不一定是100％准确.