Callicott, J. Baird.

Thinking Like a Planet = The Land Ethic and the Earth Ethic / by: Callicott, J. Baird. (Language materials, printed)

Earth Stewardship = Linking Ecology and Ethics in Theory and Practice / by: Pickett, S.T.A.; Chapin III, F. Stuart.; Rozzi, Ricardo.; Callicott, J. Baird.; Armesto, Juan J.; Power, Mary E.; SpringerLink (Online service); May Jr., Roy H. (Language materials, printed) , [http://id.loc.gov/vocabulary/relators/edt]