MARDEN ORISON SWETT. (1961). CONQUEST OF WORRY. ORIENT PUBLISHING COMPANY.
Lua i Stíl Chicago (17ú heag.)MARDEN ORISON SWETT. CONQUEST OF WORRY. DELHI: ORIENT PUBLISHING COMPANY, 1961.
Lua MLA (9ú heag.)MARDEN ORISON SWETT. CONQUEST OF WORRY. ORIENT PUBLISHING COMPANY, 1961.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.