C S Lewis's Narnia Books are still in copyright. So is this commentary, but the author has posted a copy online.
Available at:
http://hope.edu/academic/english/sch...gwiththeheart/
The author, Peter J Schakel, says:
Although Reading with the Heart: The Way into Narnia has been out-of-print since the mid-1980s, I continue to be contacted by people wanting to obtain a copy of it. Because reprinting it is not feasible, I have decided to make it available electronically. This site contains the entire book, including index, in HTML format. Original pagination is indicated by page numbers inserted in brackets [<--p. 1], for convenience in citing material from it.
This is a copyrighted book. ... Individuals may print copies of the book for personal use; but no part of the book may be reproduced for publication or sale without prior permission of the author.