Science Progress (1916-1919). Sage Publications, Inc.
Lua i Stíl Chicago (17ú heag.)Science Progress (1916-1919). Sage Publications, Inc.
Lua MLA (9ú heag.)Science Progress (1916-1919). Sage Publications, Inc.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.