There are lots of books and websites about shiatsu. It is better to experience it than to talk about it.
According to the Kalama Sutra, Buddha once said: « First consider things, then believe what you have experienced yourself ».
Here are some well-known authors anyway :
– Yuichi Kawada and Stephen Karcher : « Essential Shiatsu », Piatkus Publishers
– Tokujiro Namikoshi : « Shiatsu »
– Toru Namikoshi : « The complete book of shiatsu therapy”
– Shizuko Yamamoto, “Barefoot Shiatsu”, Japan Publications, Inc.