Columbia subject headings:
Opitz, Martin, 1597-1639--Authorship.
Opitz, Martin, 1597-1639.
Social networks--Germany--17th century.
Harvard subject headings:
Literary criticism
Opitz, Martin, 1597-1639--Criticism and interpretation.
Social networks--Germany--17th century.
Princeton subject headings:
Opitz, Martin, 1597-1639--Authorship.
Opitz, Martin, 1597-1639.
Social networks--Germany--17th century.