Resources:

Discover Kinbaku –  Alexander MA & Natasha Nawataneko’s webpage

Somatics for rope –  Natasha Nawataneko’s amazing book about bottoming in ropes.

Kinbaku Today –  Magazine with interesting articles about japanese kinbaku

Kinbaku Books –  Bergborgs page with snapshots of old kinbaku books

Nawapedia –  online encyclopedia of Japanese bondage and related kinky activities.