Columbia subject headings:
Humanities--Bibliography of bibliographies.
Humanities--Bibliography.
Humanities--Information services--Directories.
Humanities--Reference books--Bibliography.
Harvard subject headings:
Humanities--Bibliography of bibliographies.
Humanities--Information services--Directories.
Humanities--Reference books--Bibliography.
Princeton subject headings:
Humanities--Bibliography of bibliographies.
Humanities--Information services--Directories.
Reference books--Humanities--Bibliography.