code: public Bibliography makeBibliography(SelectionMode mode, CSLItemData... selection) {
  		return makeBibliography(mode, selection, null);
  	}
docs: Generates a bibliography for the registered citations. Depending
  on the selection mode selects, includes, or excludes bibliography
  items whose fields and field values match the fields and field values
  from the given example item data objects.
  @param mode the selection mode
  @param selection the example item data objects that contain
  the fields and field values to match
  @return the bibliography