The eBook, Renier van Rooyen: Father of PEP (Kindle Edition) can be purchased on Amazon for U$12.95, or as a paperback for U$29.95: https://www.amazon.com/dp/B0FNT8T8XX
Or order the 2025 edition directly on this website for U$10.95 and securely pay via Paypal at the "Buy Now" button below. You can pay with a credit card (you do not need a Paypal account). The eBook will be delivered within 24 hours as a PDF file.