Richards, L. O. (1987). A practical theology of spirituality. Zondervan Publ. House.
芝加哥风格引文Richards, Lawrence O. A Practical Theology of Spirituality. Grand Rapids, Mich: Zondervan Publ. House, 1987.
MLA引文Richards, Lawrence O. A Practical Theology of Spirituality. Zondervan Publ. House, 1987.
警告：这些引文格式不一定是100％准确.