Bodén, E. (1951). A research on the galactic clusters NGC 436 and NGC 457. Almqvist & Wiksell.
Lua i Stíl Chicago (17ú heag.)Bodén, Erik. A Research on the Galactic Clusters NGC 436 and NGC 457. Uppsala: Almqvist & Wiksell, 1951.
Lua MLA (8ú heag.)Bodén, Erik. A Research on the Galactic Clusters NGC 436 and NGC 457. Almqvist & Wiksell, 1951.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.