Willett, H. L. (1931). The daily altar: An aid to private devotion and family worship. s.n.].
Lua i Stíl Chicago (17ú heag.)Willett, Herbert Lockwood. The Daily Altar: An Aid to Private Devotion and Family Worship. [S.l: s.n.], 1931.
Lua MLA (9ú heag.)Willett, Herbert Lockwood. The Daily Altar: An Aid to Private Devotion and Family Worship. s.n.], 1931.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.