Walker, F. A. (1892). Political economy. H. Holt and company.
Lua i Stíl Chicago (17ú heag.)Walker, Francis Amasa. Political Economy. New York: H. Holt and company, 1892.
Lua MLA (8ú heag.)Walker, Francis Amasa. Political Economy. H. Holt and company, 1892.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.