| Zalman Usiskin and Jennifer Griffin, "The Classification of Quadrilaterals | Zalman Usiskin and Jennifer Griffin, "The Classification of Quadrilaterals |
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| Owen Byer; Felix Lazebnik; Deirdre L | A Study of Definition", Information Age Publishing, 2008, pp |
with interactive animation illustrating a rectangle that becomes a 'crossed rectangle', making a good case for regarding a 'crossed rectangle' as a type of rectangle.
15| with interactive animation illustrating a rectangle that becomes a 'crossed rectangle', making a good case for regarding a 'crossed rectangle' as a type of rectangle | |
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