Ehret, W. (1991). Set down, servant: Spiritual. Tetra Continuo Music Group.
芝加哥风格引文Ehret, Walter. Set Down, Servant: Spiritual. Lauderdale, Fla: Tetra Continuo Music Group, 1991.
MLA引文Ehret, Walter. Set Down, Servant: Spiritual. Tetra Continuo Music Group, 1991.
警告：这些引文格式不一定是100％准确.