Kettner, F. (1936). The need for a secretary of peace. Biosophical Institute.
Lua i Stíl Chicago (17ú heag.)Kettner, Frederick. The Need for a Secretary of Peace. New York, N.Y.: Biosophical Institute, 1936.
Lua MLA (8ú heag.)Kettner, Frederick. The Need for a Secretary of Peace. Biosophical Institute, 1936.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.