The user might be looking for free resources if they can't afford the book. Maybe there are open-access alternatives or other textbooks that are freely available. I can mention resources like HathiTrust, PubMed Central, or university library websites that might offer something similar.

Also, the user might be using a non-English browser or the book is published under a different title in Spanish. I should remind them to verify the correct edition and language.

In summary, the key points to cover are: legal distribution, respect for copyright, purchasing options, library access, open-access alternatives, and directing them to official sources. I should present this in a friendly and helpful manner, avoiding any mention of illegal file sharing or torrent sites.