I recommend lots of books and articles through this blog (you haven’t noticed?), but I try to be very sparing with the “must-read” label.
But you really should read this post by Mark Dever, reflecting on 10 things Roger Nicole taught him, and 20 interesting anecdotes about Roger Nicole.
“Remember your leaders, those who spoke to you the word of God. Consider the outcome of their way of life, and imitate their faith.”—Heb. 13:7