"Imouto sae Ireba Ii" (all good as long as we have younger sister) volume 7 by Hirasaka Yomi. This volume included a collection of meta references.
This volume isn't entirely full of meta references. The first half of this volume was spent on systematically depicting every character's reaction to the ending of volume 6. The last chapter is the text version of the drama CD, where the three writers in this series set out to write children's stories, and all managed to produce something not quite suitable for children. And there is the usual games segment, this time with Fictionary. These all maintained the usual fun quality for this series, but perhaps not the best highlights.
The main highlight of this volume came near the end, where readers found out about the original series that was named "Imouto sae Ireba Ii", written by a genius author who was subtly mentioned in one of the early volumes. This is the backstory of that author, how she dedicated her life to writing, and how it came to an end after having reached greater fame due to "Imouto sae Ireba Ii" being animated. This chapter written in a more serious tone, and included a bit about how the author received negative feedback for having a more serious volume in a series that had been mostly comedy. Coincidentally, the anime version for this series is scheduled for broadcast in fall 2017. It's like the light novel equivalent of watching yourself watch yourself recursively, it's brilliant how everything had came together to reach this point.
This volume has been another interesting glimpse of the light novel industry. I hope there are more pages given to Chihiro in future volumes.
Previous (2017-06-03): Takoyaki
Next (2017-06-24): "Hamamura Nagisa no Keisan Nooto" volume 7 by Aoyagi Aito