Leupold, H. (1952). Exposition of Ecclesiastes. Baker Book House.
Lua i Stíl Chicago (17ú heag.)Leupold, H.C. Exposition of Ecclesiastes. Grand Rapids: Baker Book House, 1952.
Lua MLA (9ú heag.)Leupold, H.C. Exposition of Ecclesiastes. Baker Book House, 1952.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.