The most reliable way to get the content in a digital, interactive format (often including a PGN-style viewer) is through authorized chess ebook platforms:
: The content is grounded in Igor Lysyj's successful high-level practical experience, including games from the Russian Championship. The most reliable way to get the content
: This platform offers the The Hedgehog vs The English Reti for $19.99. It provides an interactive board where you can play through all the moves and variations directly on your device. The most reliable way to get the content
If you prefer a hard copy or want to check local availability: The most reliable way to get the content