BDAG

A Greek-English Lexicon of the New Testament and Other Early Christian Literature, by Walter Bauer and Frederick William Danker, (Third Edition; based on  previous English editions by W.F. Arndt, F.W. Gingrich, and F.W. Danker; University of Chicago Press, 1957, 1979, 2000)

Bruce, Apostle

F. F. Bruce, Paul: Apostle of the Heart Set Free (Eerdmans, 1977)

Bruce, Galatians

F. F. Bruce, The Epistle to the Galatians (New International Greek Testament Commentary; Eerdmans, 1982)

Burton

Ernest De Witt Burton, A Critical and Exegetical Commentary on the Epistle to the Galatians (International Critical Commentary; Edinburgh: T & T Clark, 1921)

Cole

R. Alan Cole, The Epistle of Paul to the Galatians (Tyndale New Testament Commentaries; Eerdmans, 1965)

Dana and Mantey

H. E. Dana and Julius R. Mantey, A Manual Grammar of the Greek New Testament (Macmillan, 1927, 1955)

DPL

Gerald F. Hawthorne, Ralph P. Martin, and Daniel Reid (editors), Dictionary of Paul and His Letters (InterVarsity Press, 1993)

Fee, Presence

Gordon D. Fee, God's Empowering Presence: The Holy Spirit in the Letters of Paul (Baker Academic, 2011, originally published by Hendrickson Publishers, 1994)

GW

God's Word (God's Word to the Nations Bible Society, 1995)

ISBE

The International Standard Bible Encyclopedia, Geoffrey W. Bromiley (general editor), (Eerdmans, 1979-1988; fully revised from the 1915 edition)

KJV

King James Version  (Authorized Version, 1611)

Liddell-Scott

Henry George Liddell. Robert Scott, A Greek-English Lexicon (revised and augmented throughout by Sir Henry Stuart Jones with the assistance of Roderick McKenzie; Oxford, Clarendon Press, 1940, Perseus Project online edition)

Lightfoot

J.B. Lightfoot, The Epistle of St. Paul to the Galatians (Zondervan, 1975, reprinted from the 1865 edition)

Longenecker

Richard N. Longenecker, Galatians (Word Biblical Commentary; Word, 1990)

NASB

New American Standard Bible (The Lockman Foundation, 1960-1988)

NIDNTT

New International Dictionary of New Testament Theology, Colin Brown (editor; Zondervan, 1975-1978; translated with additions and revisions from Theologisches Begriffslexikon zum Neuen Testament, Coenen, Beyreuther, and Bitenhard, editors)

NIV

New International Version (International Bible Society, 1973, 1978)

NJB

New Jerusalem Bible (Darton, Longman & Todd Ltd, 1985)

NRSV

New Revised Standard Version  (Division of Christian Education of the National Council of Churches of Christ, USA, 1989)

Robertson

Archibald Thomas Robertson, Word Pictures in the New Testament (Sunday School Board of the Southern Baptist Convention, 1932, 1960)

TDNT

Theological Dictionary of the New Testament, Gerhard Kittel and Gerhard Friedrich (editors), Geoffrey W. Bromiley (translator and editor), (Eerdmans, 1964-1976; translated from Theologisches Wörterbuch zum Neuen Testament, ten volume edition)