Theologically Reformed usually hold to the following Confessions. These confessions are not held to be
inerrant or Divinely authored, but they are held by Reformed churches to teach doctrine that is accurate and true to the teachings of the Bible.
Their are three confessions that are called the "Three Forms of Unity":
The Belgic Confession
The Belgic Confession (1561) by Various
The Heidelberg Confession and
Westminster Theological Seminary - Heidelberg Catechism
The Cannons of Dort.
Historic Church Documents at Reformed.org
Presbyterians often hold to the Westminster Standards. "
The Westminster Standards" consist of: 1. The Westminster Confession of Faith. 2. The Larger Catechism. 3. The Shorter Catechism. Their are also
several additional articles that are usually published with the Standards: 1. The Directory of Public
Worship. 2The Directory of Private Worship. 3. Form of Presbyterian Church Government, and 4. The
Sum of Saving Knowledge.
The Westminster Standards | The Westminster Standard
And Reformed Baptists often hold to "
The 1689 London Baptist Confession of Faith" which was
patterned after the "Westminster Standards".
The 1689 London Baptist Confession of Faith
In addition, most would hold to older confessions such as
The Apostles Creed,
the Nicene Creed, and
the Athanasian Creed.
Anabaptists often hold to "
The Schleitheim Confession".
THE SCHLEITHEIM CONFESSION OF FAITH, 1527
It should be noted that everyone has a "confession of faith". Even people who say that they believe
nothing but the Bible, and hold to no creeds but the Bible, have some set of beliefs that they hold to be true, whether they have these beliefs written down in an organized way, or just hold to a more or less nebulous set of beliefs in their mind that they don't consciously organize.
There is an app for both IPhone, and Android called "Christian Creeds and Reformed" that has all these creeds and more.