The Heidelberg Catechism, written in 1563, is a confession of faith that offers comprehensive instruction of Reformed doctrine and theology. Traditionally attributed to theologians Zacharius Ursinus and Caspar Olevianus, the questions and answers are organized in 52 Lord’s Days, originally intended to be taught on each Sunday of the year.
The Belgic Confession, also known as the Confession of Faith, is the oldest of the doctrinal standards of the Reformed Church in America and the Christian Reformed Church. The confession originated during a time of Protestants being persecuted and thus provides a clear outline of Reformed belief.
"The Decision of the Synod of Dort on the Five Main Points of Doctrine in Dispute in the Netherlands" is popularly known as The Canons of Dort (or the Five Articles Against the Remonstrants). It consists of statements of doctrine adopted by the great Synod of Dort which met in the city of Dordrecht in 1618–1619. Although this was a national Synod of the Reformed Churches of the Netherlands, it had an international character, since it was composed not only of sixty-two Dutch delegates, but also of twenty-seven foreign delegates representing eight countries.