Your pointing out to me that Template:Ref-Book3 needed reworking was immensely helpful! I don't know what I was thinking when I created one template as another! Thank you for your assistance. However, I'm still having difficulty with Template:Ref-Book2.5. I've attempted to update it as I would such templates for the other books in the series, but perhaps I'm missing something; Book 2.5 is only a novelette and has only few chapters when compared to the novels. Have I not written the correct wiki code for the 2.5 templates (i.e., Template:Ref-Book2.5 and Template:Ref-Book2.5/doc)? Thank you for your assistance.
After looking through the templates for 3 hours this morning, I finally discovered the problems and have since corrected them. Thank you for encouraging me to keep looking. Being self-taught, I don't always have ready solutions to technical problems ... but, with encouragement, I usually figure them out. 🙂