At a time where many people have been forced to flee their home countries and live under dire circumstances, I have prioritized that this book should be as available as possible. Hence I have used Bookboon, a publishing house that provides free educational books. Some pages will have advertising by their sponsors - feel free to ignore these links.
Over the years over 450,000 people have downloaded the book. You can read the book as well. You just click here, and follow the steps.
Some links in the books references no longer works as useful sites have changed their URLs so I am currently working on 3rd edition.
Enjoy. And safe travels.