Columbia subject headings:
Harvard subject headings:
Ethics--Religious aspects--Congresses.
Happiness--Religious aspects--Congresses.
Irreligion--Congresses.
Secularism--Congresses.
Princeton subject headings:
Ethics--Congresses.
Happiness--Moral and ethical aspects--Congresses.
Happiness--Religious aspects--Christianity--Congresses.
Irreligion--Congresses.