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Catholic Encyclopedia entry on Sin

Catholic Encyclopedia entry on Contrition

Catechism of the Catholic Church from the official website of the Vatican

The Council of Trent - Session XIV - The fourth under the Supreme Pontiff, Julius III, celebrated on November 25, 1551 - The Most Holy Sacraments Of Penance And Extreme Unction

Excerpt from the Exomologetarion of Nicodemus the Hagiorite