Parkman , F. (1950). The Oregon trail. The New American Library.
Lua i Stíl Chicago (17ú heag.)Parkman , Francis. The Oregon Trail. The New American Library, 1950.
Lua MLA (9ú heag.)Parkman , Francis. The Oregon Trail. The New American Library, 1950.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.