Books for Administrative Law in UPSC Law Optional subject:

1. Administrative Law by I.P. Massey:
- This book provides a comprehensive understanding of the principles and concepts of administrative law.
- It covers topics such as delegation of powers, administrative discretion, natural justice, and administrative tribunals.
- The book also discusses the role of administrative law in the Indian context and the relationship between the executive, legislature, and judiciary.

2. Administrative Law by M.P. Jain:
- This book is considered a standard reference for administrative law and is widely recommended for UPSC Law Optional.
- It covers various aspects of administrative law, including delegated legislation, administrative adjudication, and judicial control over administrative action.
- The book also provides insights into the principles of natural justice and the concept of administrative discretion.

3. Administrative Law by S.P. Sathe:
- This book is known for its analytical approach and in-depth coverage of administrative law.
- It covers topics such as administrative process, administrative discretion, and administrative tribunals.
- The book also discusses the principles of natural justice, judicial review of administrative action, and the role of administrative law in promoting good governance.

4. Administrative Law: Cases and Materials by H.W.R. Wade:
- This book is a compilation of important cases and materials related to administrative law.
- It provides a comprehensive overview of the subject through the analysis of landmark judgments and relevant statutes.
- The book covers topics such as ultra vires, legitimate expectation, and procedural fairness.
- It also includes discussions on the impact of European Union law on administrative law in the United Kingdom.

5. Principles of Administrative Law by M.P. Jain:
- This book offers a detailed explanation of the principles and concepts of administrative law.
- It covers topics such as rule of law, separation of powers, and judicial control over administrative action.
- The book also provides insights into recent developments in administrative law, including the concept of good governance and the role of alternative dispute resolution mechanisms.

These books are highly recommended for UPSC Law Optional subject as they provide a comprehensive understanding of administrative law and cover the relevant topics in detail. It is advisable to refer to multiple books to gain a holistic understanding and enhance your knowledge in this subject.