Reference books are used to study for competitive examinations, entrance examinations. They can be used to read, gather information and increase knowledge. You can get reference books online on diverse subjects from e-commerce websites. One reference book that is great for competitive exams, interviews, general everyday use, or work-life is Impactful Communication (English, Published by SAGE Publications India Pvt Ltd., Author Deepa Sethi). Some other popular books are Encyclopedia of Samanya Vigyan (Hindi, Published by Arihant Publication), which is meant for competitive examinations such as SSC and Railways; General Studies (English, Published by Made Easy Publications, Author I. Singh and A. P. Singh), a useful book for SSC, Railways, PSUs, and Bank PO examinations; General Knowledge 2021 (English, Published by Arihant Publication, Author Manohar Pandey), which covers Geography, History, General Science, Indian Polity, and Indian Economy; and Indian Culture, Art and Heritage (English, Published by Pearson Education India, Author Devdutt Pattanaik), which is meant for candidates preparing for the Civil Services Examination. All these and many more reference books are available for you to choose from. You can place your order for the books of your choice and have them delivered to your doorstep.