1. 1. Masaaki Koyama; Stores choosing customers are favored by customers - Stories of six stores reborn to be profitable stores with signs, Nikkei BP, 2012 (in Japanese).
2. 2. Masaaki Koyama, Yuki Takahashi and Hisao Shiizuka; Analysis and Evaluation of the Sign by Deviation Value - Proposal of the Sign Deviation Value for Improving Custpmer Satisfaction - Transactions of Japan Society of Kansei Engineering, Vol.12, No.1, pp.193-205, 2013.
3. 3. Ken Noguchgi: Planning and design of the intersection, Gijutsu Shoin, 2006.
4. 4. Intersection design: http://www.pref.yamanashi.jp/douroseibi/documents/13_kousaten.pdf
5. 5. Koji Tanaka, Takashi Kato; The effect of adding the arrow to the emergency exit light which gives to the route search, The Japanese Psychological Association, 2011.