2[2]Louis P.Pojman,Enviromental Ethics:Readings in Theory and Application,Third Edition,Wadsworth,a division of Thomson learning,Australia,2001.
3[3]J.D.Heffeman,The Land Ethic:A Critical Appraisal.
4[4]Isabelle Maginan,"antecedents and Benefits of Corporate Citizenship:A Comparison of U.S.and French Businesses," Unpublished Ph.D.dissertation,University of Memphis,1997.
