HERE ARE SOME OF THE BEST,  AUTHORITATIVE RESOURCES FOR THE VALIDITY AND CREDIBILITY OF HISTORIC CHRISTIANITY.

​CATHOLIC
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CATECHISM OF THE CATHOLIC CHURCH

CATHOLIC ANSWERS (THE PREMIERE APOSTOLATE FOR CATHOLIC APOLOGETICS)
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CATHOLIC CHURCH: CODE OF CANON LAW

​NEW ADVENT (HISTORIC CHRISTIAN DOCUMENTS)
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PAPAL ENCYCLICALS ONLINE (FULL HISTORIC CHURCH DOCUMENTS INCLUDING CHURCH COUNCILS)

UNITED STATES CATHOLIC CATECHISM FOR ADULTS

UNITED STATES CONFERENCE OF CATHOLIC BISHOPS (REFERENCES AND RESOURCES FOR THE CATHOLIC CHURCH IN THE UNITED STATES AND ITS TERRITORIES)

​EVANGELICAL/PROTESTANT
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CENTER FOR REFORMED THEOLOGY AND APOLOGETICS

WESTMINSTER CONFESSION OF FAITH
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REFORMED HISTORIC CHURCH DOCUMENTS

DOCUMENTS OF THE PROTESTANT REFORMATION