This definition came from Theopedia:

TULIP is an acronym used to summarize the Five Points of Calvinism, which were codified in the Canons of Dort by the Synod of Dort in 1618 and 1619, which met to address the points raised by the Arminians of that day.

History of TULIP

There is no certainty regarding the origin of the acronym TULIP. However, the five points of Calvinism were discussed, as such, before the popular rise of this acronym, for example in R. L. Dabney's work, The Five Points of Calvinism, circa 1878. Dabney's five headings are total depravity, effectual calling, God's election, particular redemption, and perseverance of the saints.

The earliest use of TULIP in this regard appears to be in 1905 by Rev. Cleland Boyd McAfee, in a lecture before the Presbyterian Union, Newark, NJ, as recorded by William H. Vail, writing in The New Outlook (1913).

The popular use of TULIP as a teaching device was stimulated by Loraine Boettner in The Reformed Doctrine of Predestination first published in 1932.

The Five Points of Calvinism, known as the doctrines of grace and summarized with the acronym TULIP is a subheading found under Reformed Theology. Below are some links defending the Five Points of Calvinism and are in no certain order at this time. Later these links will be organized and placed under each letter to which the acronym summarizes.

Sovereign Grace Defended by A. H. Strong (Pdf)

The Doctrines of Election and Perseverance by John Newton (Pdf)

Covenant, Universal Call and Definite Atonement by Roger Nicole (Pdf)

Objections to Election by William Sasser (Pdf)

Discourse on the Decree of Election by Jonathan Dickinson

Five Doctrines of Grace by Stanford E. Murrell (Pdf)

“Problematic Texts” for Definite Atonement in the Pastoral and General Epistles by Thomas R. Schreiner

Effectual Calling by William Macleod

The Five Points by Stephen Rees

Does the Bible Teach the Doctrine of Original Sin? by Sam Storms

The Five Points of Calvinism by W. J. Seaton

The Doctrine of the Atonement by J. Gresham Machen

God's Sovereignty and the Human Will by A. W. Pink

The Wrath of God in relation to the Atonement by Frederick S. Leahy

The Impotency of the Human Will by Arthur W. Pink

There's More to Calvinism than the Five Points of Calvinism by Kenneth J. Stewart (Pdf)

Mp3's:

Divine Election by Dr. James Montgomery Boice

Randall Klynsma:

The Five Points of Calvinism Pt 1—Total depravity

The Five Points of Calvinism Pt 2—Unconditional Election

The Five Points of Calvinism Pt 3—Limited Atonement

The Five Points of Calvinism Pt 4—Irresistible Grace

The Five Points of Calvinism pt 5—Perseverance of the Saints