With respect ''Pugilistic Animus'' gave you a helpful answer and you are nit picking. The fact is seaplane flying is far more prevalent in the USA and Canada than it is here in Europe with the result that more people there have the knowledge, experience and know how to put pen to paper and write informed books about it.
To get relevent licensing and legal information pertaining to seaplane operation in your country just contact your local CAA to find out where and what information to look for. Frequently legal info that is put in training text-books gets outdated anyway regardless of the regulating authority it pertains towards so this is something that you would need to keep an eye and up to date on anyway as I'm sure you already know.
The above approach would also equally apply to boyouage systems differences as well as clear up the differences between FAA and CAA approaches to these operations.
Flying is flying at the end of the day no matter where one does it and the rules aren't usually so very different when it comes down to it. Have fun with it!