Undset, S. (1954). Catherine of Siena. Sheed and Ward.
Lua i Stíl Chicago (17ú heag.)Undset, Sigrid. Catherine of Siena. New York: Sheed and Ward, 1954.
Lua MLA (8ú heag.)Undset, Sigrid. Catherine of Siena. Sheed and Ward, 1954.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.