Possible steps: 1. Inform them about copyright laws. 2. Suggest purchasing from legitimate sources. 3. Recommend looking for public domain version, if available. 4. Provide links to legal resources like the author's website or official publishers. 5. Offer summaries or study guides if allowed. 6. Check if there's a library option through interlibrary loan.
Wait, is there an official version of this book that's freely available? Maybe the 5th edition isn't public domain yet. I should confirm the copyright status. But I don't have real-time data. So safest is to assume it's under copyright.
If you’re a student facing financial constraints, consider reaching out to your educational institution for assistance or exploring low-cost alternatives like secondhand copies of previous editions.