Não informado. (1957). Summary of engineering research. University of Illinois, Engineering Experiment Station.
Lua i Stíl Chicago (17ú heag.)Não informado. Summary of Engineering Research. Urbana, Ill: University of Illinois, Engineering Experiment Station, 1957.
Lua MLA (8ú heag.)Não informado. Summary of Engineering Research. University of Illinois, Engineering Experiment Station, 1957.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.