US Department of Labor. (1969). Manpower research projects. s.n.
Lua i Stíl Chicago (17ú heag.)US Department of Labor. Manpower Research Projects. s.l: s.n, 1969.
Lua MLA (9ú heag.)US Department of Labor. Manpower Research Projects. s.n, 1969.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.