Knight, G. R. (2001). I Used to be Perfect: A study of sin and salvation (2ª edición.). Andrews University Press.
Citazione stile Chigago Style (17a edizione)Knight, George R. I Used to Be Perfect: A Study of Sin and Salvation. 2ª edición. Berrien Springs, Michigan: Andrews University Press, 2001.
Citatione MLA (9a ed.)Knight, George R. I Used to Be Perfect: A Study of Sin and Salvation. 2ª edición. Andrews University Press, 2001.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.