DUFFIE, D. (1989). Future Markets. Prentice Hall.
Lua i Stíl Chicago (17ú heag.)DUFFIE, Darrell. Future Markets. Prentice Hall, 1989.
Lua MLA (8ú heag.)DUFFIE, Darrell. Future Markets. Prentice Hall, 1989.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.