(1995). Field Engineer's Manual Robert O Parmley. McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)Field Engineer's Manual Robert O Parmley. McGraw-Hill, 1995.
Lua MLA (8ú heag.)Field Engineer's Manual Robert O Parmley. McGraw-Hill, 1995.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.