This is the most reliable source, as the book is a standard text in most Indian universities.
To help find alternative study materials, let me know your (undergraduate or postgraduate) or the specific topic (like CRISPR, bioreactors, or gene cloning) you are researching. I can recommend free, open-access textbooks or specific peer-reviewed review articles that match your needs. Share public link Biotechnology Expanding Horizons By B D Singh Pdf Free