Não informado. (1946). McGraw Hill digest: Engineering, industry, science, business. McGraw-Hill Publications.
Lua i Stíl Chicago (17ú heag.)Não informado. McGraw Hill Digest: Engineering, Industry, Science, Business. New York: McGraw-Hill Publications, 1946.
Lua MLA (8ú heag.)Não informado. McGraw Hill Digest: Engineering, Industry, Science, Business. McGraw-Hill Publications, 1946.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.