"The readings are introduced simply: 'A reading from _____, chapter ____."
So in Matins and Vespers in the Altar Book. Similarly in the Divine Services. How annoying it is to hear: "Our First reading for this day, the [name of Sunday or feast], comes from the X chapter of the Book of X, beginning at the X verse"! And yet even THAT is better than when the reader seeks to give a "context" to the reading. For Pete's sake! It's GOD'S word that has the power. Let's shut up and get around to it, already. Just telling the book and the chapter more than suffices. Give a brief silence and then plunge into the power of God's own speaking. Do not show your disbelief in the power of God's word by YOUR need to add words to His. Let His words suffice and trust them to do what they promise!