Upton, M. (1996). The economics of tropical farming systems. Cambridge University Press.
Lua i Stíl Chicago (17ú heag.)Upton, Martin. The Economics of Tropical Farming Systems. Cambridge ; New York: Cambridge University Press, 1996.
Lua MLA (9ú heag.)Upton, Martin. The Economics of Tropical Farming Systems. Cambridge University Press, 1996.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.