Bibby, D. L. (1962). The challenge to the executive: An address.
Lua i Stíl Chicago (17ú heag.)Bibby, Dause L. The Challenge to the Executive: An Address. Minneapolis, 1962.
Lua MLA (8ú heag.)Bibby, Dause L. The Challenge to the Executive: An Address. 1962.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.