Hi
If you live near Japanese Embasy or Consulate General Ofiice of Japan, visit to then. Normaly they have free information to general public and may have small liburaly. Also ask for JETRO'e web site or phone number. From Jetro you can find any information about Japan or even about your country information. Jetro may not have Japanese garden book but they have general information about Japan
Japanese garden concept cab be use inside of office building,resaurant, as well as home.

Jetro is stand for Japan Exteranal Trade Organization which is non profit organization. Their job is provide you information and not selling one thing.
Visit to myjapanesegared.org or International Japanese garden association's site.

About Jurnal Of Japanese Gardening.
If you or your parents are welthy, it won't hurt you. If you have tight budget, then look for other book specificly provide information.Try Amazon.com and serch for Japanese landscaping book. Some book is just ok. other is excelent.
Do you need list of Good Japanese garden book?
mike y