Kan Sasaki, "What is an ordained priest?" - What is a priest in the first place? Recommended reference book for thinking about Japanese Buddhism and precepts.
As the title of this book suggests, "What is ordination? Some may get the impression from the introduction that this book sounds difficult, but rest assured, it is not. The narrative of Dr. Kan Sasaki is very easy to understand and read.
The book also discusses the uniqueness of such Japanese Buddhism. After all, it is only by comparing the two that we can see what we can see. The book is also very stimulating because it provides a detailed look at the actual conditions of life in early Buddhism in India and Sri Lanka.