1. 1) Globally Harmonized System of Classification and Labelling of Chemicals (GHS). http://www.unece.org/trans/danger/publi/ghs/ghs_welcome_e.html. Accessed June 5, 2008.
2. 2) Rev.2 Globally Harmonized System of Classification and Labelling of Chemicals (GHS). http://www.mhlw.go.jp/bunya/roudoukijun/anzeneisei07/pdf/f-all.pdf. Accessed June 5, 2008 (in Japanese).
3. 3) Rev.2 Globally Harmonized System of Classification and Labelling of Chemicals (GHS). http://www.env.go.jp/chemi/ghs/kariyaku2.html. Accessed June 5, 2008 (in Japanese).
4. 4) Classification Results. http://www.safe.nite.go.jp/ghs/list.html. Accessed June 5, 2008.
5. 5) GHS Classification Tool. http://www.meti.go.jp/policy/chemical_management/GHS/land%20of%20thousand%20of%20GHS%20classification.htm. Accessed June 5, 2008.