Wilkinson, L. (1980). Earthkeeping: Christian stewardship of natural resources. Wm.B.Eerdmans.
Lua i Stíl Chicago (17ú heag.)Wilkinson, Loren. Earthkeeping: Christian Stewardship of Natural Resources. Grand Rapids: Wm.B.Eerdmans, 1980.
Lua MLA (9ú heag.)Wilkinson, Loren. Earthkeeping: Christian Stewardship of Natural Resources. Wm.B.Eerdmans, 1980.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.