Previewing/ Examining my mentor text

Letters to Cristina by Paulo Freire
Since I'm curious about writing an education book using the letter-writing format, I thought this book would be useful. Writing a regular book about education would be pretty formal with the vocabulary and such going on. The letter writing is a little more informal, so I want to examine that. I also want to examine how the letters are written (shape and style), but also how the chunking works. I can still get to the heavy stuff, but it might not be dressed in the vocabulary. The chunking, well that's how the letters are separated. How are the different ideas from such a huge concept broken up. How does the author use narratives? How much of it is theory?

Come Be My Light by Mother Teresa
My interest in this book is like above. How are the letters split up? I'm curious about how this book may be different because these letters were never meant to be exposed. Also, is there a difference between writing about religion and writing about pedagogy.

Birthday Girl with Possum by Brendan Constantine
I'm curious about this book because it was recommended to me by a fellow poet. As I'm always writing poetry, I'm looking for new shapes, topics, and ways to approach the writing.