Who said reading can’t be competitive? Every few months, we’ll be challenging you to read a list of selected books. Print out the challenge and cross the titles off as you go. Show off how much you’ve read by taking a picture and tweeting @penguinrandom or Instagramming (@penguinrandomhouse) with the hashtag #challengeyourshelf. There are always books on your to-be-read shelf, so why not challenge yourself? We picked 26 of our bestsellers, from A-Z to read. Show us how many you finish! (click image to see full size and print out)