Introduction:
NCERT books are considered the backbone of UPSC preparation, including the subject of History. They provide a comprehensive understanding of the topics and concepts covered in the syllabus. However, referring to additional reference books can further enhance your preparation and provide a deeper insight into the subject.

Benefits of referring to additional reference books:

1. Wider coverage of topics: NCERT books provide a basic understanding of historical events and concepts. However, additional reference books offer a wider coverage of topics, providing more detailed information and different perspectives. This can help you gain a better understanding of the subject and enrich your knowledge.

2. In-depth analysis: While NCERT books provide a concise overview, reference books delve deeper into historical events, analyzing their causes, consequences, and impact on society. This in-depth analysis can help you develop a nuanced understanding of history and answer questions in a more comprehensive manner.

3. Multiple perspectives: NCERT books often present a singular narrative of historical events. Additional reference books, on the other hand, may offer different perspectives and interpretations. By referring to these books, you can develop a broader understanding of history, evaluate different viewpoints, and form your own opinions.

4. Supplementary information: NCERT books may not cover all the relevant information required for the UPSC examination. Additional reference books can provide supplementary information on specific topics, helping you grasp the subject more comprehensively and improving your chances of scoring well in the examination.

5. Practice questions and exercises: Reference books often include practice questions, exercises, and sample papers that can help you test your knowledge and practice answering questions in a UPSC-like format. This can be immensely helpful in improving your exam preparation and time management skills.

Conclusion:
While NCERT books are essential for UPSC History preparation, referring to additional reference books can provide a more thorough understanding of the subject. They offer a wider coverage of topics, in-depth analysis, multiple perspectives, supplementary information, and practice questions. However, it is important to choose reliable and trusted reference books to ensure accurate and relevant information.