Não informado. (1962). Work-Environment-Health. Institute of Occupational Health.
Lua i Stíl Chicago (17ú heag.)Não informado. Work-Environment-Health. Helsinki: Institute of Occupational Health, 1962.
Lua MLA (8ú heag.)Não informado. Work-Environment-Health. Institute of Occupational Health, 1962.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.