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The substance of Presbyterian belief is contained in the Westminster Confession of Faith, drafted by the Puritan English Parliament in 1643. Its main provisions are the Calvinist predestination belief that the Church founded by Christ was essentially invisible and "consists of the whole number of the elect," a spiritual and not bodily presence of Christ in the Eucharist, and a deference to civil authority that is characteristically Presbyterian.

"In 1648, the first printing of the Larger and Shorter Catechisms of the Westminster Assembly were made available for distribution and sale in England and Scotland. They remain the clearest expressions of Reformed Protestantism ever formulated..."
- May 13, This Week in Religion History

Confession and Catechisms [introduction to the Westminster Confession of Faith]

The Westminster Confession of Faith
[from the Orthodox Presbyterian Church website]
Chapter 1: Of the Holy Scripture
Chapter 2: Of God, and of the Holy Trinity
Chapter 3: Of God’s Eternal Decree
Chapter 4: Of Creation
Chapter 5: Of Providence
Chapter 6: Of the Fall of Man, of Sin, and of the Punishment Thereof
Chapter 7: Of God’s Covenant with Man
Chapter 8: Of Christ the Mediator
Chapter 9: Of Free Will
Chapter 10: Of Effectual Calling
Chapter 11: Of Justification
Chapter 12: Of Adoption
Chapter 13: Of Sanctification
Chapter 14: Of Saving Faith
Chapter 15: Of Repentance unto Life
Chapter 16: Of Good Works
Chapter 17: Of the Perseverance of the Saints
Chapter 18: Of the Assurance of Grace and Salvation
Chapter 19: Of the Law of God
Chapter 20: Of Christian Liberty and Liberty of Conscience
Chapter 21: Of Religious Worship and the Sabbath Day
Chapter 22: Of Lawful Oaths and Vows
Chapter 23: Of the Civil Magistrate
Chapter 24: Of Marriage and Divorce
Chapter 25: Of the Church
Chapter 26: Of the Communion of Saints
Chapter 27: Of the Sacraments
Chapter 28: Of Baptism
Chapter 29: Of the Lord’s Supper
Chapter 30: Of Church Censures
Chapter 31: Of Synods and Councils
Chapter 32: Of the State of Men after Death, and of the Resurrection of the Dead
Chapter 33: Of the Last Judgment