Knight, G. R. (2001). I Used to be Perfect: A study of sin and salvation (2ª edición.). Andrews University Press.
Chicago-čujuhus (17. p.)Knight, George R. I Used to Be Perfect: A Study of Sin and Salvation. 2ª edición. Berrien Springs, Michigan: Andrews University Press, 2001.
MLA-čujuhus (9. p.)Knight, George R. I Used to Be Perfect: A Study of Sin and Salvation. 2ª edición. Andrews University Press, 2001.
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