http://www.natsume-books.com/list_photo.php?id=133004
◇ Franz Gertsch The Retrospective ―フランツ・ゲルチュ画集 - 古書・古本の通販 | 古本スカラベ
http://sukarave.shop-pro.jp/?pid=54313782
◇ Franz Gertsch - Google 検索
https://www.google.com/search?q=Franz+Gertsch&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiost6qgLzPAhXEFZQKHXKYA6cQ_AUICCgB&biw=1436&bih=803
◇ Museum Franz Gertsch
http://www.museum-franzgertsch.ch/
◇ Franz Gertsch - Wikipedia, the free encyclopedia
https://en.wikipedia.org/wiki/Franz_Gertsch