I’m quite frequently asked if it’s okay to print a copy of my e-booklets, and my answer is always the same: “Of course it is!”
Just because the booklets are delivered digitally as convenient, easy-to-navigate, interactive e-booklets doesn’t mean that you can’t print and use them as companions as you work. In fact, I encourage you to treat them as working booklets in which you make notes in the margins, underline or highlight passages, and flag pages with little 3M flags or paper clips—whatever works for you.
David Sax in his book, The Revenge of Analog – Real Things and Why They Matter, quotes Maria Sebregondi of Moleskin notebooks, “We as human beings need to be stimulated with our senses, very physically. With sight, smell, taste, touch, and sound. We really need physical objects and experiences.”
So, it’s not only okay to print a working copy for your own use (as I mention in the copyright notice of every booklet), but I encourage you to do it. And, if you can, make it a colour print so as to get the most out of the illustrations.