Gordon, R. (1966). Readings in business cycles. George Allen & Unwin.
Lua i Stíl Chicago (17ú heag.)Gordon, R. Readings in Business Cycles. London: George Allen & Unwin, 1966.
Lua MLA (9ú heag.)Gordon, R. Readings in Business Cycles. George Allen & Unwin, 1966.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.