Gurewich, Vladimir (1957). „Observations on the Iconography of the Wound in Christ's Side, with Special Reference to Its Position”. Journal of the Warburg and Courtauld Institutes. Warburg Institute. 20 (3/4): 358—362. JSTOR50787. S2CID192284546. doi:10.2307/750787.
Gurewich, Vladimir (1957). „Observations on the Iconography of the Wound in Christ's Side, with Special Reference to Its Position”. Journal of the Warburg and Courtauld Institutes. Warburg Institute. 20 (3/4): 358—362. JSTOR50787. S2CID192284546. doi:10.2307/750787.
Sharpe, Alfred. „Doubt”. The Catholic Encyclopedia. Vol. 5. New York: Robert Appleton. Приступљено 2008-10-21. „A state in which the mind is suspended between two contradictory propositions and unable to assent to either of them.”
Schulte, Karl Joseph (1910). „George Hermes”. The Catholic Encyclopedia. 7. New York: Robert Appleton. Приступљено 2008-10-21.
Gurewich, Vladimir (1957). „Observations on the Iconography of the Wound in Christ's Side, with Special Reference to Its Position”. Journal of the Warburg and Courtauld Institutes. Warburg Institute. 20 (3/4): 358—362. JSTOR50787. S2CID192284546. doi:10.2307/750787.