(1971). Directory of testing laboratories, commercial-institutional.
Lua i Stíl Chicago (17ú heag.)Directory of Testing Laboratories, Commercial-institutional. 1971.
Lua MLA (9ú heag.)Directory of Testing Laboratories, Commercial-institutional. 1971.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.