Heraldry Society of Scotland. The double tressure.
Lua i Stíl Chicago (17ú heag.)Heraldry Society of Scotland. The Double Tressure. Edinburgh.
Lua MLA (8ú heag.)Heraldry Society of Scotland. The Double Tressure.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.