Não informado. (1971). Closed Loop: The magazine of mechanical testing. MTS Systems.
Lua i Stíl Chicago (17ú heag.)Não informado. Closed Loop: The Magazine of Mechanical Testing. Minneapolis, Minn: MTS Systems, 1971.
Lua MLA (8ú heag.)Não informado. Closed Loop: The Magazine of Mechanical Testing. MTS Systems, 1971.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.