Flowers, T. H. (1976). Introduction to exchange systems. Wiley.
Lua i Stíl Chicago (17ú heag.)Flowers, Thomas Harold. Introduction to Exchange Systems. London: Wiley, 1976.
Lua MLA (9ú heag.)Flowers, Thomas Harold. Introduction to Exchange Systems. Wiley, 1976.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.