Mind Map: Schools of Buddhism
http://jameskennedymonash.wordpress.com/2012/05/02/mind-map-schools-of-buddhism/
※仏教宗派全体の系図．
Genealogy of Tibetan Buddhist schools
http://en.wikipedia.org/wiki/File:Genealogy_of_Tibetan_Buddhist_schools.png
※チベット仏教の系図
調べれば，ほかにもたくさんありそう．
Cf. Wikepedia - Tibetan Buddhism | Schools of Buddhism
