Lua APA (7ú heag.)

Bartel, W. Wilhelm Pieck.

Lua i Stíl Chicago (17ú heag.)

Bartel, Walter. Wilhelm Pieck. Berlin.

Lua MLA (8ú heag.)

Bartel, Walter. Wilhelm Pieck.

Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.