Since the title is plural, referring to it should be as a plural too. It is no different than saying Judges 10. Now if they said my favorite psalms is psalm 13, you might have a point, as it is, you are getting angry over YOUR IGNORANCE.
YOU KNOW WHAT REALLY GRINDS MY GEARS? WHEN SOMEONE SAYS, "TURN TO PSALMS #WHATEVER."; IT IS THE BOOK OF PSALMS AND EACH PSALM IS SINGULAR YOU CRETIN. S
