Here is a short bibliography on the fruit of the Spirit in Galatians 5.  Feel free to add books in the comments section of this post.

William Barclay — Flesh and Spirit
W. Y. Fullerton — The Christly Life (Fullerton was Spurgeon’s assistant)
W. Phillip Keller — A Gardener Looks at the Fruit of the Spirit
Alexander Maclaren — Expositions of Holy Scripture: Second Corinthians (chaps 7 to end), Galatians, and Philippians