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→Bibliography
[http://www.google.ca/url?sa=t&rct=j&q=steering%20law%20sub%20menu&source=web&cd=2&ved=0CCMQFjAB&url=http%3A%2F%2Fciteseerx.ist.psu.edu%2Fviewdoc%2Fdownload%3Fdoi%3D10.1.1.118.7601%26rep%3Drep1%26type%3Dpdf&ei=0iq7To-uFaXZ0QHx5eDeCQ&usg=AFQjCNHrOOm9nR54M4rbGAuFJ8fq1CteiA&cad=rja Modeling and improving selection in cascading pull-down menus using Fitts' law, the steering law and force fields]
[http://msdn.microsoft.com/en-us/library/windows/desktop/aa511499.aspx Microsoft commands design principles]
[http://msdn.microsoft.com/en-us/library/windows/desktop/aa511493.aspx Microsoft tabs design principles]
Photoshop UI:
