Some time ago I did not quite know the answer to that question.
There is no doubt that the Bible comes first. The reason for that is that the author of the Bible is the Holy Spirit. I remember also that the Lord Jesus Christ says, “Heaven and earth will pass away, but my words will never pass away.” You find that in Matthew 24:35
But lately I have read the five books by G. F. Dempster. The title of the first book is “FINDING MEN FOR CHRIST.” The other four books have different titles, but they are also about Personal Evangelism. (P. E.)
At the present time I am also blessed by reading testimonies by catholic priests. They are telling how they came out of darkness into light. I have two volumes in German, altogether 50 stories. The two books were sent to me by friends in Germany long ago, and I think I remember that correctly. ENGLISH: FAR FROM ROME, NEAR TO GOD, Banner of Truth, 1997.
Now I know which books come second. I think the reason why I did not quite know the answer to the above question (Which books come second?) is, I love also the Expositions of Books of the Bible by D. M. Lloyd-Jones.