Do not trust a PDF claiming to be "official" unless you bought it directly from Kukkiwon, ITF, or a major martial arts publisher.
Finding high-quality, verified Taekwondo PDF books can be a challenge with so much fragmented information online. Whether you are training under the World Taekwondo (WT/Kukkiwon) style or the International Taekwon-Do Federation (ITF) taekwondo pdf books verified
The Encyclopedia of Taekwon-Do (15-Volume Set) by Gen. Choi Hong Hi Do not trust a PDF claiming to be