For a refresher course on text features, my go-to book is:
This book has a table of contents, headings, text boxes, pictures and captions, key words in bold, an index, and a glossary. (As a bonus extra, it has a narrative lead, in case you collect nonfiction books with a variety of leads!)
Here is my stack of mentor texts for text structures:
Question/Answer structure
Narrative structure
How-To structure
Sequential structure
Organized around the metaphor of a mountain
Organized numerically (bonus -- gorgeously written descriptive lead)
Compare/Contrast structure
Organized by colors
Main Idea/Detail structure
Sequential structure (tells the end first, then goes back and tells the steps)
Cause/Effect structure
ABC structure
Poem + Information structure