Columbia subject headings:
Inachus (Greek deity)--In literature.
Io (Greek mythological character)--In literature.
Sophocles. Inachos.
Harvard subject headings:
Inachus (Greek deity)--In literature.
Io (Greek mythological character)--In literature.
Literary criticism
Sophocles. Inachos
Princeton subject headings:
Sophocles. Inachos.