E-Book: You can order the Intuitive Geometry E-book here.
Paperback: You can order the Intuitive Geometry Paperback book here. They are currently only available from South Africa.
Hardcover: The Intuitive Geometry Hardcover Book (ISBN 978-1-928538-97-4) is now available worldwide through your nearest bookstore. Order the hardcover today on Amazon: Intuitive Geometry: Drawing with overlapping circles