Prototype JavaScript Framework
↑ “ついにRails 3.1がリリース、体感速度が速くなる!?”. Rails Hub情報局. 2011年9月1日閲覧。
↑ Defining classes and inheritance, in the Prototype documentation
↑ Class-based vs prototype-based languages, in mozilla.org's JavaScript guide
↑ Inheriting Properties, in mozilla.org's JavaScript guide