Some readers may prefer to have an electronic version of the book. It allows you to use search, bookmark and annotate content. The electronic distribution also makes the production of the book cheaper and hence the book can be sold at a better price. I created a PDF version of the book and it is now available for ordering from Lulu. Please notice that it is an Adobe Digital Edition PDF file. You need the free Adobe Digital Edition software to read the book on your OS X or Windows computer.