Não informado. (1921). American Journal of Hygiene. John Hopkins University, School of Hygiene and Public Health.
Lua i Stíl Chicago (17ú heag.)Não informado. American Journal of Hygiene. Baltimore, Md: John Hopkins University, School of Hygiene and Public Health, 1921.
Lua MLA (8ú heag.)Não informado. American Journal of Hygiene. John Hopkins University, School of Hygiene and Public Health, 1921.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.