Knight, G. R. (2001). I Used to be Perfect: A study of sin and salvation (2ª edición.). Andrews University Press.
芝加哥风格引文Knight, George R. I Used to Be Perfect: A Study of Sin and Salvation. 2ª edición. Berrien Springs, Michigan: Andrews University Press, 2001.
MLA引文Knight, George R. I Used to Be Perfect: A Study of Sin and Salvation. 2ª edición. Andrews University Press, 2001.
警告：这些引文格式不一定是100％准确.