1Lawrence Buell.The Environmental Imagination:Thoreau,Nature Writing,and the Formation of American Culture[M].Boston:The Belknap Press of Harvard University Press,1996.
2Lynn White.The Historical Roots of Our Ecological Crisis from The Ecocriticism Reader:Landmarks in Literary Ecology edited by Cheryll Glotfelty and Harold Fromm[C].Athens:the University of Georgia Press,1996.
