Altman, D. (2005). Unjustified restrictions on letters to the editor. Public Library of Science.
Lua i Stíl Chicago (17ú heag.)Altman, D. Unjustified Restrictions on Letters to the Editor. Public Library of Science, 2005.
Lua MLA (9ú heag.)Altman, D. Unjustified Restrictions on Letters to the Editor. Public Library of Science, 2005.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.