Columbia subject headings:
Bioethics--Bibliography.
Ecology--Moral and ethical aspects--Bibliography.
Environmental ethics--Bibliography.
Environmental protection--Moral and ethical aspects--Bibliography.
Nature conservation--Moral and ethical aspects--Bibliography.
Harvard subject headings:
Bioethics--Bibliography.
Ecology--Moral and ethical aspects--Bibliography.
Environmental ethics--Bibliography.
Environmental protection--Moral and ethical aspects--Bibliography.
Nature conservation--Moral and ethical aspects--Bibliography.
Princeton subject headings:
Bioethics--Bibliography.
Ecology--Moral and ethical aspects--Bibliography.
Environmental ethics--Bibliography.
Environmental protection--Moral and ethical aspects--Bibliography.
Nature conservation--Moral and ethical aspects--Bibliography.