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"The oldest fossils reveal evolution of non-vascular plants by the middle to late Ordovician Period (~450-440 m.y.a.) on the basis of fossil spores" Transition of plants to landArchived 1999년 10월 9일 - 웨이백 머신
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"The oldest fossils reveal evolution of non-vascular plants by the middle to late Ordovician Period (~450-440 m.y.a.) on the basis of fossil spores" Transition of plants to landArchived 1999년 10월 9일 - 웨이백 머신
Barry, Patrick L. (January 28, 2002). "The Great DyingArchived 2009년 4월 7일 - 웨이백 머신". Science@NASA. Science and Technology Directorate, Marshall Space Flight Center, NASA. Retrieved March 26, 2009
