Columbia subject headings:
Crusades--Public opinion--History.
Crusades.
Peace--Religious aspects--Christianity.
Propaganda, European.
Public opinion--Europe--History.
War--Religious aspects--Christianity.
Harvard subject headings:
Crusades
Crusades--Public opinion--History.
Peace--Religious aspects--Christianity
Propaganda, European.
Public opinion--Europe--History.
War--Religious aspects--Christianity
Princeton subject headings:
Crusades--Public opinion--History.
Crusades.
Propaganda, European.
War--Religious aspects--Christianity.