Hard copies are available through retailers like Chess.co.uk and Amazon . The Hedgehog vs the English/Reti. - Amazon.ca
It explains how to navigate transitions from early moves like 1. c4 c5 or 1. c4 b6 to ensure Black reaches the desired "ditch" formation. Hard copies are available through retailers like Chess
You can purchase and download the interactive ebook version via Forward Chess for $19.99. Hard copies are available through retailers like Chess