开放教学与学术演示资源，共 20 页。原作者：Emily K Mace; Craig E Aalseth; Jill M Brandenberger; Anthony R Day; Eric W Hoppe; Paul H Humble; Martin E Keillor; Cory T Overman; Mark E Panisko; Allen Seifert; Signe K White; Richard M Williams。保留原文件语言与内容。
资源署名：Emily K Mace; Craig E Aalseth; Jill M Brandenberger; Anthony R Day; Eric W Hoppe; Paul H Humble; Martin E Keillor; Cory T Overman; Mark E Panisko; Allen Seifert; Signe K White; Richard M Williams · cc-by-4.0 · 原始来源
