Ley, W. (1980). The Poles. Time-Life Books.
Lua i Stíl Chicago (17ú heag.)Ley, Willy. The Poles. Hongkong: Time-Life Books, 1980.
Lua MLA (9ú heag.)Ley, Willy. The Poles. Time-Life Books, 1980.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.