Achinstein, A. (1950). Introduction to business cycles. Thomas Y. Crowell-Company.
Lua i Stíl Chicago (17ú heag.)Achinstein, Asher. Introduction to Business Cycles. Thomas Y. Crowell-Company, 1950.
Lua MLA (8ú heag.)Achinstein, Asher. Introduction to Business Cycles. Thomas Y. Crowell-Company, 1950.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.