Downing, R. I. (1958). National superannuation: Means test or contributionsn The 28th Joseph Fisher lecture in commerce, given in Adelaide on September 24, 1958. Griffin Press.
Lua i Stíl Chicago (17ú heag.)Downing, Richard Ivan. National Superannuation: Means Test or Contributionsn The 28th Joseph Fisher Lecture in Commerce, Given in Adelaide on September 24, 1958. Adelaide: Griffin Press, 1958.
Lua MLA (9ú heag.)Downing, Richard Ivan. National Superannuation: Means Test or Contributionsn The 28th Joseph Fisher Lecture in Commerce, Given in Adelaide on September 24, 1958. Griffin Press, 1958.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.