Wickersham, E. D. (1956). The "Guaranteed Wage" in Michigan.
Lua i Stíl Chicago (17ú heag.)Wickersham, Edward D. The "Guaranteed Wage" in Michigan. Detroit, 1956.
Lua MLA (8ú heag.)Wickersham, Edward D. The "Guaranteed Wage" in Michigan. 1956.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.