There are some good books written about Unit 731 and the Japanese warfare experiments which we recommend if you want to further read about it.
Below is a list of books that you can purchase from either Amazon or BookDepository. *BookDepository is a website based in the UK that offers free shipping worldwide on all books.
This book by Hal Gold published in 2002 is one of the most popular books about the subject of Japan’s experiments during WWII. Unit 731 Testimony has many first hand experiments from people who participated in the experiments.
This book concentrates on the experiences of the people who participated in the experiments rather than on its history. It is an invaluable resource as it gives a glimpse into the details of the experiments and the humans that perpetrated them.